Cursor, Set Based Approach
Sep 7, 2007
I am replacing cursor logic in a SP to a setbased approach to scale better. My setbased approach seems to be better but it runs very fractionaly faster (execution time) than the cursor approach for a single run in test environment. I think resource cost wise, my set based approach should be better. Number of rows iterated thru this cursor is small (0-150). This particular SP is called over 2000 times in production everyday. Is it worth the trouble changing this if we get only marginally benefits, will my set-based approach work better on a server that has lot of activity (lot of connections etc). Our db server runs at about 75-85% cpu usage daily and this particular SP accounts to 13% CPU usage for 2000+ executions.
If the data set involved in cursors is small, is it worth the trouble changing them to set based approaches?
Am I doing right to change this SP to setbased approach.
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Jul 20, 2005
Hi,I am trying a Set Approach instead of Using of Cursor (which works).I am attaching the SQL to create tables and the my Procedure, and apiece of code to execute the Procedure.I would like the Procedure ReplaceTags to work with 'a' the same aswith 'C'.Thanks in advance.Hareesh/*****************************//* Create Tables */IF EXISTS (SELECT * FROM dbo.sysobjects WHERE ID =OBJECT_ID(N'GlobalTags') AND OBJECTPROPERTY(id, N'IsUserTable') = 1)DROP TABLE GlobalTagsGOCREATE TABLE GlobalTags(Project VARCHAR(50) NULL,TagName VARCHAR(50) NULL,[Value] VARCHAR(50) NULL)GOIF EXISTS (SELECT * FROM dbo.sysobjects WHERE ID =OBJECT_ID(N'ProductDetails') and OBJECTPROPERTY(id, N'IsUserTable') =1)DROP TABLE ProductDetailsGOCREATE TABLE ProductDetails(Project VARCHAR(50) NULL,KeyName VARCHAR(50) NULL,[Value] VARCHAR(50) NULL)GO/*********************************//* Populate Tables */TRUNCATE TABLE GlobalTagsINSERT INTO GlobalTags (Project, TagName, Value)VALUES('ProjectName', 'FirstName', 'John')INSERT INTO GlobalTags (Project, TagName, Value)VALUES('ProjectName', 'LastName', 'Doe')INSERT INTO GlobalTags (Project, TagName, Value)VALUES('ProjectName', 'PhoneNo', '5248')INSERT INTO GlobalTags (Project, TagName, Value)VALUES('ProjectName', 'ZIPCode', '55555')TRUNCATE TABLE ProductDetailsINSERT INTO ProductDetails (Project, KeyName, Value)VALUES('ProjectName', 'FirstName', '%FirstName%')INSERT INTO ProductDetails (Project, KeyName, Value)VALUES('ProjectName', 'LastName', '%LastName%')INSERT INTO ProductDetails (Project, KeyName, Value)VALUES('ProjectName', 'PhoneNo', '%PhoneNo%')INSERT INTO ProductDetails (Project, KeyName, Value)VALUES('ProjectName', 'ZIPCode', '%ZIPCode%')/****************************//* Procedure */IF EXISTS (SELECT * FROM sysobjects WHERE name = 'ReplaceTags')DROP PROCEDURE ReplaceTagsGOCREATE PROCEDURE ReplaceTags(@aProjectName VARCHAR(50),@aProcessType CHAR(1))ASBEGINDECLARE @TagName VARCHAR(50)DECLARE @Value VARCHAR(50)IF @aProcessType = 'C'BEGINDECLARE REPLACE_CURSOR CURSOR FAST_FORWARD READ_ONLY FORSELECT TagName, Value FROM GlobalTagsWHERE Project = @aProjectNameOPEN REPLACE_CURSORFETCH NEXT FROM REPLACE_CURSOR INTO @TagName, @ValueWHILE (@@FETCH_STATUS = 0)BEGINUPDATE ProductDetailsSETValue =CASE WHEN CHARINDEX('%' + @TagName + '%', Value, 1) > 0THENREPLACE(Value, '%' + @TagName + '%', @Value)ELSEValueENDWHERE Project = @aProjectNameFETCH NEXT FROM REPLACE_CURSOR INTO @TagName, @ValueENDCLOSE REPLACE_CURSORDEALLOCATE REPLACE_CURSORENDELSEBEGINUPDATE ProductDetailsSETValue =CASE WHEN CHARINDEX('%' + GlobalTags.TagName + '%',ProductDetails.Value, 1) > 0 THENREPLACE(ProductDetails.Value, '%' +GlobalTags.TagName + '%', GlobalTags.Value)ELSEProductDetails.ValueENDFROM ProductDetails INNER JOIN GlobalTagsON (ProductDetails.Project = GlobalTags.Project)WHERE ProductDetails.Project = @aProjectNameENDEND/***********************************//* Run Procedure */EXECUTE ReplaceTags 'ProjectName', 'a'-- EXECUTE ReplaceTags 'ProjectName', 'C'SELECT * FROM GlobalTagsSELECT * FROM ProductDetails/* End*//***********************************/
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Feb 1, 2007
im practicing set based approaches... and what im trying to do is grab each value from a table , scramble it and put it back in the table... i dont want the solution to this as id rather figure it out myself for practice...
the thing im stuck at is i can do this with a cursor but i want to avoid cursors in future, how would i use a set based approach to get each value of a table and work with it?
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Aug 7, 2006
Hi all.
I am not a programer but managed to piece together an Access database that is the backbone of my company.
My IT group advised me to move to an SQL server back end and move to a web based front end.
My question. I am very comfortible with Access and modify the databases regularly. What front end is most like Access for modifying forms, reports, macros, etc.
Thanks!
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Jan 14, 2007
Hi
I have an VB.NET application connected to a SQL Server Express. I want to let the application to run in either "Normal mode" or "Holiday mode" according to current weekday is normal day or state public holiday.
My approach is to find out all the public holidays in a year and enter them into a Holiday Table. Then some code in my application constantly check the current weekday against the one in the holiday table, if matches, the application goes into holiday mode.
This approach is not perfect as "State public holidays" are confirmed by the state government in the current year and the coming year. So state public holidays are unconfirmed for the third year afterward. The system is required by client to support public holiday in the next 10 years.
I wonder what is the best approach to this problem?
Thanks
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Jul 20, 2005
Does anyone have any good references they could recommend on Cursorbased SQL writing? I have to create SQL that can loop though recordssimular to VB loops and I have been told that this is the way to go.Any recommendations would be helpful.
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Nov 9, 2005
Guys
Here's the scenario
create table data1 (dealid varchar(6) , datex smalldatetime , Tn INT)
insert data1 (dealid , datex , Tn )
values ('12345' , '31-12-2005' , 9999)
insert data1 (dealid , datex , Tn )
values ('12345' , '30-11-2005' , 9999)
insert data1 (dealid , datex , Tn )
values ('12345' , '31-10-2005' , 9999)
insert data1 (dealid , datex , Tn )
values ('98765' , '31-12-2005' , 2)
insert data1 (dealid , datex , Tn )
values ('98765' , '30-11-2005' , 1)
insert data1 (dealid , datex , Tn )
values ('98765' , '30-11-2005' , 0)
select * from data1
I need to update the Tn column from the default 9999 for the 3 rows in this table where the dealid is 12345 based on the value in the datex column so the row with the 'highest ie most recent date' gets a 0. I then need to assign the value 1 to the next highest and so on until all rows (in this case 3) get incrementing integer values. It's easy with a cursor but can't get my head round doing it in a set-based way
Any ideas
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Feb 13, 2002
Hi there!
Here is my situation:
table 'ReceiptHeader'
IDCustomerIDDateCreated
1225102/06/2002
1332102/09/2002
1444002/15/2002
table 'ReceiptDiscount'
IDDiscountIDReceiptHeaderIDAmount
111210.00
241250.00
311325.00
**a receipt can have multiple discounts**
Table 'ReceiptDetail'
ReceiptHeaderID LineItemIDTotal
121155.33
131145.33
141241.66
**for this example there is only one line item per receipt**
Without using a cursor, i would like to return a result set
like this one below using a set based solution...
ReceiptIDCustomerIDDiscountTotal
1225160.00155.33
1332125.00145.33
144400.00241.66
Thanks,
SF
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Jun 2, 2008
Hey All,
I am trying to convert cursor based stored proc in to set based simple statements stored proc. As this stored proc has created alot of performance issues. I am confuse now as I spent my most of time creating this stored proc. Please advise how can I convert this stored proc into set base simple statment.
Thanks in advance.
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
ALTER Procedure [SampleStoredProc]
@Var1varchar(20),
@Var2varchar(3),
@Var3 varchar(2) = 'Dummy'
As
declare @selectlist varchar(5000)
declare @tableBuild varchar(1000)
declare @FieldName varchar(50)
declare @FieldSelect varchar(500)
declare @FieldTitle varchar(50)
declare @TableName varchar(50)
declare @holdTable varchar(50)
declare @title varchar(50)
declare @holdTitle varchar(50)
declare @PageName varchar(50)
declare @sequence varchar(100)
declare @extraCriteria varchar(200)
declare @holdCriteria varchar(200)
declare @insertSQL varchar(5000)
declare @ConvertRoutine varchar(500)
declare @loopCtrl1 bit
declare @loopCtrl2 bit
declare @ConvertSQL varchar(5000)
declare @PrevValue varchar(50)
declare @NewValue varchar(50)
declare @ActionTxtvarchar(1)
declare @Descriptionvarchar(20)
declare @effDatevarchar(10)
declare @transEffDatevarchar(10)
declare @expDatevarchar(10)
declare @lastTransDatevarchar(10)
declare @policyStatusvarchar(2)
declare @reasAmendDescvarchar(50)
declare @policyNumbervarchar(20)
declare @riskStatevarchar(20)
declare @PriorPremmoney
declare @AmendPremmoney
declare @PremDiffmoney
declare mtcursor cursor for
select TableName, FieldName, FieldSelectTxt, FieldTitleTxt, SequenceFieldName, ExtraCriteriaTxt, PageTitleTxt, ConversionRoutineTxt from MyTable1
where Column1 = @Var2
order by PageDisplaySequenceNbr, TableName, ExtraCriteriaTxt, SequenceFieldName
open mtcursor
fetch next from mtcursor into @TableName, @FieldName, @FieldSelect, @FieldTitle, @sequence, @extraCriteria, @title, @ConvertRoutine
set @selectlist = 'Val1, Val2,' + @sequence + ' as UnitNbr'
set @tableBuild = 'Create table #tempTable (Val1 varchar, Val2 int, UnitNbr varchar(20)'
set @loopCtrl1 = 0
set @loopCtrl2 = 0
WHILE (@loopCtrl1 = 0)
begin
set @holdTable = @TableName
set @holdCriteria = @extraCriteria
set @holdTitle = @title
if @FieldSelect = ''
set @selectlist = @selectlist + ',' + @FieldName
else
set @selectlist = @selectlist + ',' + @FieldSelect
set @tableBuild = @tableBuild + ',' + @FieldName + ' varchar(50)'
fetch next from mtcursor into @TableName, @FieldName, @FieldSelect, @FieldTitle, @sequence, @extraCriteria, @title, @ConvertRoutine
if @@fetch_status <> 0
set @loopCtrl2 = 1
if (@TableName <> @holdTable) or (@extraCriteria <> @holdCriteria) or (@title <> @holdTitle) or (@loopCtrl2 = 1)
begin
set @tableBuild = @tableBuild + ')'
set @insertSQL = '
declare mtcursor2 cursor for
select FieldName, FieldTitleTxt, ExtraUpdateMatchTxt, PullForUpdateInd, PullForAddInd, PullForDeleteInd, PullForAnyUpdateInd from MyTable1
where TableName = ''' + @holdTable + '''
and ExtraCriteriaTxt = ''' + @holdCriteria + '''
and PageTitleTxt = ''' + @holdTitle + '''
and Column1 = ''' + @Var2 + '''
order by FieldDisplaySequenceNbr
declare @FieldName varchar(50)
declare @FieldTitle varchar(50)
declare @ExtraUpdateMatch varchar(500)
declare @PullUpdate bit
declare @PullAdd bit
declare @PullDelete bit
declare @PullAnyUpdate bit
open mtcursor2
fetch next from mtcursor2 into @FieldName, @FieldTitle, @ExtraUpdateMatch, @PullUpdate, @PullAdd, @PullDelete, @PullAnyUpdate
WHILE (@@fetch_status = 0)
begin
if substring(@FieldTitle,1,1) = ''#''
set @FieldTitle = substring(@FieldTitle,2,len(@FieldTitle) - 1)
else
set @FieldTitle = '''''''' + @FieldTitle + ''''''''
if @PullAnyUpdate = 1
begin
exec (''INSERT MyTable2 SELECT ''''' + @Var1 + ''''', A.UnitNbr, ''''' + @holdTitle + ''''', '' + @FieldTitle + '', A.'' + @FieldName + '', B.'' + @FieldName + '', ''''U''''
from #tempTable A left join #tempTable B on B.UnitNbr = A.UnitNbr and B.Val1 = ''''U'''' '' + @ExtraUpdateMatch + ''
where A.Val1 = ''''O'''' and B.Val1 = ''''U'''''')
end
else
begin
if @PullUpdate = 1
exec (''INSERT MyTable2 SELECT ''''' + @Var1 + ''''', A.UnitNbr, ''''' + @holdTitle + ''''', '' + @FieldTitle + '', A.'' + @FieldName + '', B.'' + @FieldName + '', ''''U''''
from #tempTable A left join #tempTable B on B.UnitNbr = A.UnitNbr and B.Val1 = ''''U'''' '' + @ExtraUpdateMatch + ''
where A.Val1 = ''''O'''' and B.Val1 = ''''U'''' and ((A.'' + @FieldName + '' <> B.'' + @FieldName + '') or (A.'' + @FieldName + '' is null and B.'' + @FieldName + '' is not null)
or (A.'' + @FieldName + '' is not null and B.'' + @FieldName + '' is null)) '')
end
if @PullAdd = 1
exec(''INSERT MyTable2 SELECT ''''' + @Var1 + ''''', UnitNbr, ''''' + @holdTitle + ''''','' + @FieldTitle + '', ''''n/a'''', '' + @FieldName + '', ''''A'''' from #tempTable A where Val1 = ''''A'''''')
if @PullDelete = 1
exec(''INSERT MyTable2 SELECT ''''' + @Var1 + ''''', UnitNbr, ''''' + @holdTitle + ''''','' + @FieldTitle + '', '' + @FieldName + '', ''''n/a'''', ''''D''''
from #tempTable A where Val1 = ''''D'''''')
fetch next from mtcursor2 into @FieldName, @FieldTitle, @ExtraUpdateMatch, @PullUpdate, @PullAdd, @PullDelete, @PullAnyUpdate
end
close mtcursor2
deallocate mtcursor2'
exec (@tableBuild + ' insert into #tempTable select ' + @selectlist + ' from ' + @holdTable + ' where Id = ' + '''' + @Var1 + '''' + @holdCriteria + @insertSQL)
set @selectlist = 'Val1, Val2,' + @sequence + ' as UnitNbr'
set @tableBuild = 'Create table #tempTable (Val1 varchar, Val2 int, UnitNbr varchar(20)'
end
if @loopCtrl2 = 1
set @loopCtrl1 = 1
end
close mtcursor
deallocate mtcursor
Delete from MyTable2 where ltrim(rtrim(PreviousValueTxt)) = ltrim(rtrim(EndorsedValueTxt)) and ActionTxt='U' and ID=@Var1
declare deletecursor cursor for
select distinct PageNm from MyTable2 where Id = @Var1 and ActionTxt = 'U'
open deletecursor
fetch next from deletecursor into @PageName
while @@fetch_status = 0
begin
if (SELECT count(*) from MyTable2 where Id = @Var1 and PageNm = @PageName and ActionTxt = 'U' and PreviousValueTxt <> EndorsedValueTxt ) = 0
DELETE FROM MyTable2 where Id = @Var1 and PageNm = @PageName and ActionTxt = 'U'
fetch next from deletecursor into @PageName
end
close deletecursor
deallocate deletecursor
declare convertcursor cursor for
select a.PreviousValueTxt, a.EndorsedValueTxt, A.EntrySequenceNbr, A.ActionTxt, b.ConversionRoutineTxt from MyTable2 a
inner join MyTable1 b
on a.PageNm = b.PageTitleTxt and a.FieldNm = b.FieldTitleTxt and b.ConversionRoutineTxt <> ''
where a.Id = @Var1
open convertcursor
fetch next from convertcursor into @PrevValue, @NewValue, @Sequence, @ActionTxt, @ConvertRoutine
while @@fetch_status = 0
begin
set @ConvertSQL = 'declare @PrevConverted varchar(50) declare @NewConverted varchar(50)'
set @ConvertSQL = @ConvertSQL + ' declare @ConvertInput varchar(50) '
set @ConvertSQL = @ConvertSQL + ' declare @Var3 varchar(2) '
set @ConvertSQL = @ConvertSQL + ' set @Var3 = ''' + @Var3 + ''''
if @ActionTxt = 'A'
set @ConvertSQL = @ConvertSQL + ' set @PrevConverted = ''' + @PrevValue + ''''
else
begin
set @ConvertSQL = @ConvertSQL + ' set @ConvertInput = ''' + @PrevValue + ''''
set @ConvertSQL = @ConvertSQL + ' set @PrevConverted = (' + @ConvertRoutine + ')'
end
if @ActionTxt = 'D'
set @ConvertSQL = @ConvertSQL + ' set @NewConverted = ''' + @NewValue + ''''
else
begin
set @ConvertSQL = @ConvertSQL + ' set @ConvertInput = ''' + @NewValue + ''''
set @ConvertSQL = @ConvertSQL + ' set @NewConverted = (' + @ConvertRoutine + ')'
end
set @ConvertSQL = @ConvertSQL + ' update MyTable2 set PreviousValueTxt = @PrevConverted, EndorsedValueTxt = @NewConverted
where EntrySequenceNbr = ''' + @Sequence + ''''
exec (@ConvertSQL)
fetch next from convertcursor into @PrevValue, @NewValue, @Sequence, @ActionTxt, @ConvertRoutine
end
close convertcursor
deallocate convertcursor
if @Var2 = 'PA '
--exec PAConfirmCovConversions @Var1 = @Var1
exec PAConfirmCovConversions @Var1 = @Var1, @Var3 = @Var3
Create table #pageSeqTable (PageTitle varchar(50), PageSeq int)
insert into #pageSeqTable
select distinct PageTitleTxt, PageDisplaySequenceNbr
from MyTable1
where Column1 = @Var2
select PageNm, RowNumber, FieldNm, PreviousValueTxt, EndorsedValueTxt, ActionTxt
from MyTable2, #pageSeqTable b
where Id = @Var1 and PageNm = b.PageTitle
order by b.PageSeq, RowNumber, ActionTxt desc, EntrySequenceNbr
select @effDate = convert(char,EffectiveDate,101), @transEffDate = convert(char,TransactionEffectiveDt,101), @expDate = convert(char,LastTransactionEffectiveDt,101),
@policyStatus = PolicyStatusCd, @reasAmendDesc = ReasonAmendedDes,
@policyNumber = PolicyNumber,
@riskState = StateName,
@AmendPrem = convert(money,PremiumAmount)
from SHPlaninfo A, SHSeleReasonAmended B, SHSeleStateCode C
where Id = @Var1
AND Val2 = (select max(Val2)
from SHPlanInfo
where Id = @Var1)
AND B.ReasonAmendedCd = A.ReasonAmendedCd
AND C.StateCode = A.RiskState
Select @PriorPrem = convert(money,PremiumAmount) FROM SHPlanInfo WHERE Id = @Var1 and Val2 = '0'
Set @PremDiff = @AmendPrem - @PriorPrem
select EffectiveDate = @effDate
select TransactionEffectiveDt = @transEffDate, ExpirationDate = @expDate, LastTransactionEffectiveDt = @lastTransDate
select AmendXPolStat = @policyStatus
select ReasonAmendedDes = @reasAmendDesc
select PolicyNumber = @policyNumber
select RiskState = @riskState
select PriorPremium = @PriorPrem select AmendPremium = @AmendPrem select PremiumDifference = @PremDiffSelect ClientNumber from SHClient with (nolock) where Id=@Var1 and ApplicantRecordInd = 1
delete from MyTable2 where Id = @Var1
return
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Mar 28, 2006
I know this question has been asked. And the usual answer is don't usecursors or any other looping method. Instead, try to find a solutionthat uses set-based queries.But this brings up several questions / senarios:* I created several stored procedures that take parameters and insertsthe data into the appropriate tables. This was done for easy access/usefrom client side apps (i.e. web-based).Proper development tactics says to try and do "code reuse". So, if Ialready have stored procs that do my logic, should I be writing asecond way of handling the data? If I ever need to change the way thedata is handled, I now have to make the same change in two (or more)places.* Different data from the same row needs to be inserted into multipletables. "Common sense" (maybe "gut instinct" is better) says to handleeach row as a "unit". Seems weird to process the entire set for onetable, then to process the entire set AGAIN for another table, and thenYET AGAIN for a third table, and so on.* Exception handling. Set based processing means that if one row failsthe entire set fails. Looping through allows you to fail a row butallow everything else to be processed properly. It also allows you togather statistics. (How many failed, how many worked, how many wereskipped, etc.)?? Good idea ?? The alternative is to create a temporary table (sandboxor workspace type thing), copy the data to there along with "status" or"valdation" columns, run through the set many times over looking forany rows that may fail, marking them as such, and then at the end onlydealing with those rows which "passed" the testing. Of course, in orderfor this to work you must know (and duplicate) all constraints so youknow what to look for in your testing.
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Sep 18, 2006
Hi,
I am declaring the cursor based on a query which is generated dynamically. but it is not working
Declare @tempSQL varchar(1000)
--- This query will be generated based on my other conditon and will be stored in a variable
set @tempsql = 'select * from orders'
declare cursor test for @tempsql
open test
This code is not working.
please suggest
Nitin
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Jan 30, 2008
I have a set of revenue records where there is a UNIT column and a REVCHARGE column. What I need to do is breakout the records into single records where the unit count is > 1 and calc the actual charge:
Ex:
Units REVCHG FIELD_A FIELD_B .....
3 3.00 ABCD EFGH
Needs to be converted to:
Units REVCHG FIELD_A FIELD_B .....
1 1.00 ABCD EFGH
1 1.00 ABCD EFGH
1 1.00 ABCD EFGH
The calc is obvious but how can I do this with a cursor but would like to do it without a cursor if possible? Anybody got an idea?
Thanks.
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Jul 30, 2007
ID DATE(dd/mm/yy) TYPE QTYIN COST_IN_AMT COST_OUT_AMT(MOVING AVERAGE)
1 01/01/2007 PURCHASE 10 1000
2 01/01/2007 PURCHAES 5 1100
3 01/01/2007 SALES -5 *TobeCalculated
4 02/01/2007 Purchase 20 9000
5 02/01/2007 SALES -10 *TobeCalculated
5 02/01/2007 purchase 50 8000
6 03/01/2007 Sales -10 *TobeCalculate
7 01/01/2007 Purchase 20 12000
I have a table when user add new sales or puchase will be added to this table ITEM_TXNS. The above date is part of the table for a ProductID . (The field is removed here)
In order to calculate the balance amount using moving average, I must calculated the cost_out_amt first on the fly.
When user add new sales I also need to determine the cost/unit for a product id using moving average. The problem is I can not just use sum, because i need to determine cost_out_amt for each sales first which will be calculated on the fly.
The reason i dont store the cost_out_amt (instead calculate on the fly) because User could Edit the previous sales/purchase txn or Insert new sales for a previous date. Example THe record with ID 9. By Adding this txn with ID 9, would cause all the cost_out_amt will be incorrect (Using moving Average) if i store the cost_amout_out on entrying txn and need to be recalculated.
Instead I just want to calculate on the fly and able to determine the cost avr for a specific point of time.
Should I just use Cursor and loop all the record and calculate the cost or maybe I can just use on Select Statement?
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Jul 20, 2005
I am begginner at best so I hope someone that is better can help.I have a stored procedure that updates a view that I wrote using 2cursors.(Kind of a Inner Loop) I wrote it this way Because I couldn'tdo it using reqular transact SQL.The problem is that this procedure is taking longer and longer to run.Up to 5 hours now! It is anaylizing about 30,000 records. I thinkpartly because we add new records every month.The procedure works like this.The first Cursor stores a unique account and duedate combination fromthe view.It then finds all the accts in the view that have that account duedatecombo and loads them into Cursor 2 this groups them together for datamanipulation. The accounts have to be grouped this way because aaccount can have different due dates and multiple records within eachaccount due date combo and they need to be looked at this way aslittle singular groups.Here is my procedure I hope someone can shead some light on this. Myboss is giving me heck about it. (I think he thinks Girls cant code!)I got this far I hope someone can help me optimize it further.CREATE PROCEDURE dbo.sp_PromiseStatusASBEGINSET NOCOUNT ON/* Global variables */DECLARE @tot_pay moneyDECLARE @rec_upd VARCHAR(1)DECLARE @todays_date varchar(12)DECLARE @mActivityDate2_temp datetimeDECLARE @tot_paydate datetime/* variables for cursor ACT_CUR1*/DECLARE @mAcct_Num1 BIGINTDECLARE @mDueDate1 datetime/* variables for ACT_CUR2 */DECLARE @mAcct_Num2 BIGINTDECLARE @mActivity_Date2 datetimeDECLARE @mPromise_Amt_1 moneyDECLARE @mPromise_Status varchar(3)DECLARE @mCurrent_Due_Amt moneyDECLARE @mDPD intDECLARE @mPromise_Date datetimeSELECT @todays_date =''+CAST(DATEPART(mm,getdate()) AS varchar(2))+'/'+CAST(DATEPART(dd,getdate()) AS varchar(2))+'/'+CAST(DATEPART(yyyy,getdate()) AS varchar(4))+''DECLARE ACT_CUR1 CURSOR FORSELECT DISTINCTA.ACCT_NUM,A.DUE_DATEFROM VWAPPLICABLEPROMISEACTIVITYRECORDS AOPEN ACT_CUR1FETCH NEXT FROM ACT_CUR1 INTO @mAcct_Num1 , @mDueDate1WHILE (@@FETCH_STATUS = 0)BEGINSELECT @rec_upd = 'N 'DECLARE ACT_CUR2 CURSOR FORSELECTB.ACCT_NUM,B.ACTIVITY_DATE,B.PROMISE_AMT_1,B.PROMISE_STATUS,B.CURRENT_DUE_AMT,B.DAYS_DELINQUENT_NUM,B.PROMISE_DATE_1FROM VWAPPLICABLEPROMISEACTIVITYRECORDS B (UPDLOCK)WHERE B.ACCT_NUM = @mAcct_Num1ANDB.DUE_DATE = @mDueDate1ORDER BY B.ACCT_NUM,B.DUE_DATE,B.ACTIVITY_DATE,CASEB.Time_ObtainedWHEN 0 THEN 0ELSE 1END Desc, B.Time_ObtainedOPEN ACT_CUR2FETCH NEXT FROM ACT_CUR2INTO @mAcct_Num2 ,@mActivity_Date2,@mPromise_Amt_1,@mPromise_Status ,@mCurrent_Due_Amt,@mDPD,@mPromise_DateWHILE (@@FETCH_STATUS = 0)BEGIN----CHECK------------------------------------------------------------------------DECLARE @PrintVariable2 VARCHAR (8000)--SELECT @PrintVariable2 = CAST(@MACCT_NUM2 AS VARCHAR)+''+CAST(@MACTIVITY_DATE2 AS VARCHAR)+' '+CAST(@MPROMISE_AMT_1 ASVARCHAR)+' '+CAST(@MPROMISE_STATUS AS VARCHAR)+''+CAST(@mCurrent_Due_Amt AS VARCHAR)+' '+CAST(@mDPD AS VARCHAR)+''+CAST(@mPromise_Date AS VARCHAR)--PRINT @PrintVariable2----ENDCHECK------------------------------------------------------------IF @mDPD >= 30BEGINSELECT @tot_pay = SUM(CONVERT(FLOAT, C.PAY_AMT))FROM vwAplicablePayments CWHERE C.ACCT_NUM = @mAcct_Num2ANDC.ACTIVITY_DATE >= @mActivity_Date2ANDC.ACTIVITY_DATE < @mActivity_Date2 + 15----CHECK------------------------------------------------------------------------DECLARE @PrintVariable3 VARCHAR (8000)--SELECT @PrintVariable3 ='Greater=30 DOLLARS COLLECTED'--PRINT @PrintVariable3----ENDCHECK------------------------------------------------------------ENDELSE IF @mDPD < 30BEGINSELECT @tot_pay = SUM(CONVERT(FLOAT, C.PAY_AMT))FROM vwAplicablePayments CWHERE C.ACCT_NUM = @mAcct_Num2ANDC.ACTIVITY_DATE >= @mActivity_Date2ANDC.ACTIVITY_DATE BETWEEN @mActivity_Date2 AND@mPromise_Date + 5----CHECK----------------------------------------------------------------------DECLARE @PrintVariable4 VARCHAR (8000)--SELECT @PrintVariable4 ='Less 30 DOLLARS COLLECTED'--PRINT @PrintVariable4----END CHECK------------------------------------------------------------END----------------------------------------MY REVISEDLOGIC-------------------------------------------------------IF @rec_upd = 'N'BEGINIF @mDPD >= 30BEGINSELECT @mActivityDate2_temp = @mActivity_Date2 + 15--DECLARE @PrintVariable5 VARCHAR (8000)--SELECT @PrintVariable5 =' GREATER= 30 USING ACTVITY_DATE+15'--PRINT @PrintVariable5ENDELSE IF @mDPD < 30BEGINSELECT @mActivityDate2_temp = @mPromise_Date + 5--DECLARE @PrintVariable6 VARCHAR (8000)--SELECT @PrintVariable6 =' LESS 30 USING PROMISE_DATE+5'--PRINT @PrintVariable6ENDIF @tot_pay >= 0.9 * @mCurrent_Due_Amt--used to be promise amtBEGINUPDATE VWAPPLICABLEPROMISEACTIVITYRECORDSSET PROMISE_STATUS = 'PK',TOTAL_DOLLARS_COLL = @tot_payWHERE CURRENT OF ACT_CUR2--This statement updates the time that the status was placedinto PK.IF @mPromise_Status IN ('PTP','OP')BEGINUPDATE VWAPPLICABLEPROMISEACTIVITYRECORDSSET Status_Date = @todays_dateWHERE CURRENT OF ACT_CUR2ENDSELECT @rec_upd = 'Y 'ENDIF ((@tot_pay < 0.9 * @mCurrent_Due_Amt) OR @tot_pay IS NULL)AND( @mActivityDate2_temp > @todays_date )--need to put 1dayof month here for snapshot9/01/2004BEGINUPDATE VWAPPLICABLEPROMISEACTIVITYRECORDSSETPROMISE_STATUS = 'OP'WHERE CURRENT OF ACT_CUR2--This statement updates the time that the status was placedinto OP which is the original Activity Date.--The record will hold this date until it goes into PK,PB,orIP.IF @mPromise_Status IN ('PTP','OP')BEGINUPDATE VWAPPLICABLEPROMISEACTIVITYRECORDSSET Status_Date = @mActivity_Date2WHERE CURRENT OF ACT_CUR2ENDENDELSE IF ((@tot_pay < 0.9 * @mCurrent_Due_Amt) OR @tot_pay ISNULL)AND( @mActivityDate2_temp <= @todays_date )--need to put 1dayof month here for snapshot 9/01/2004BEGINUPDATE VWAPPLICABLEPROMISEACTIVITYRECORDSSETPROMISE_STATUS = 'PB',TOTAL_DOLLARS_COLL = case when @tot_pay is nullthen 0 else @tot_pay endWHERE CURRENT OF ACT_CUR2--This statement updates the time that the status was placedinto PB.IF @mPromise_Status IN ('PTP','OP')BEGINUPDATE VWAPPLICABLEPROMISEACTIVITYRECORDSSET Status_Date = @todays_dateWHERE CURRENT OF ACT_CUR2ENDENDENDELSE IF @rec_upd = 'Y'BEGINUPDATE VWAPPLICABLEPROMISEACTIVITYRECORDSSETPROMISE_STATUS = 'IP',TOTAL_DOLLARS_COLL = 0WHERE CURRENT OF ACT_CUR2--This statement updates the time that the status was placedinto IP.IF @mPromise_Status NOT IN ('IP')BEGINUPDATE VWAPPLICABLEPROMISEACTIVITYRECORDSSET Status_Date = @todays_dateWHERE CURRENT OF ACT_CUR2ENDENDFETCH NEXT FROM ACT_CUR2 INTO @mAcct_Num2,@mActivity_Date2,@mPromise_Amt_1,@mPromise_Status ,@mCurrent_Due_Amt,@mDPD,@mPromise_DateENDCLOSE ACT_CUR2DEALLOCATE ACT_CUR2FETCH NEXT FROM ACT_CUR1 INTO @mAcct_Num1 , @mDueDate1ENDCLOSE ACT_CUR1DEALLOCATE ACT_CUR1SET NOCOUNT OFFENDGO
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Aug 12, 2015
In MSDN file I read about static cursor
STATIC
Defines a cursor that makes a temporary copy of the data to be used by the cursor. All requests to the cursor are answered from this temporary table in
tempdb; therefore, modifications made to base tables are not reflected in the data returned by fetches made to this cursor, and this cursor does not allow modifications
It say's that modifications is not allowed in the static cursor. I have a questions regarding that
Static Cursor
declare ll cursor global static
           for select name, salary from ag
 open ll
            fetch from ll
Â
             while @@FETCH_STATUS=0
              fetch from ll
               update ag set salary=200 where 1=1
Â
  close ll
deallocate ll
In "AG" table, "SALARY" was 100 for all the entries. When I run the Cursor, it showed the salary value as "100" correctly.After the cursor was closed, I run the query select * from AG.But the result had updated to salary 200 as given in the cursor. file says modifications is not allowed in the static cursor.But I am able to update the data using static cursor.
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Jul 20, 2005
Hello,I have a test database with table A containing 10,000 rows and a tableB containing 100,000 rows. Rows in B are "children" of rows in A -each row in A has 10 related rows in B (ie. B has a foreign key to A).Using ODBC I am executing the following loop 10,000 times, expressedbelow in pseudo-code:"select * from A order by a_pk option (fast 1)""fetch from A result set""select * from B where where fk_to_a = 'xxx' order by b_pk option(fast 1)""fetch from B result set" repeated 10 timesIn the above psueod-code 'xxx' is the primary key of the current Arow. NOTE: it is not a mistake that we are repeatedly doing the Aquery and retrieving only the first row.When the queries use fast-forward-only cursors this takes about 2.5minutes. When the queries use dynamic cursors this takes about 1 hour.Does anyone know why the dynamic cursor is killing performance?Because of the SQL Server ODBC driver it is not possible to havenested/multiple fast-forward-only cursors, hence I need to exploreother alternatives.I can only assume that a different query plan is getting constructedfor the dynamic cursor case versus the fast forward only cursor, but Ihave no way of finding out what that query plan is.All help appreciated.Kevin
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Sep 20, 2007
I'm trying to implement a sp_MSforeachsp howvever when I call sp_MSforeach_worker
I get the following error can you please explain this problem to me so I can over come the issue.
Msg 16958, Level 16, State 3, Procedure sp_MSforeach_worker, Line 31
Could not complete cursor operation because the set options have changed since the cursor was declared.
Msg 16958, Level 16, State 3, Procedure sp_MSforeach_worker, Line 32
Could not complete cursor operation because the set options have changed since the cursor was declared.
Msg 16917, Level 16, State 1, Procedure sp_MSforeach_worker, Line 153
Cursor is not open.
here is the stored procedure:
Alter PROCEDURE [dbo].[sp_MSforeachsp]
@command1 nvarchar(2000)
, @replacechar nchar(1) = N'?'
, @command2 nvarchar(2000) = null
, @command3 nvarchar(2000) = null
, @whereand nvarchar(2000) = null
, @precommand nvarchar(2000) = null
, @postcommand nvarchar(2000) = null
AS
/* This procedure belongs in the "master" database so it is acessible to all databases */
/* This proc returns one or more rows for each stored procedure */
/* @precommand and @postcommand may be used to force a single result set via a temp table. */
declare @retval int
if (@precommand is not null) EXECUTE(@precommand)
/* Create the select */
EXECUTE(N'declare hCForEachTable cursor global for
SELECT QUOTENAME(SPECIFIC_SCHEMA)+''.''+QUOTENAME(ROUTINE_NAME)
FROM INFORMATION_SCHEMA.ROUTINES
WHERE ROUTINE_TYPE = ''PROCEDURE''
AND OBJECTPROPERTY(OBJECT_ID(QUOTENAME(SPECIFIC_SCHEMA)+''.''+QUOTENAME(ROUTINE_NAME)), ''IsMSShipped'') = 0 '
+ @whereand)
select @retval = @@error
if (@retval = 0)
EXECUTE @retval = [dbo].sp_MSforeach_worker @command1, @replacechar, @command2, @command3, 0
if (@retval = 0 and @postcommand is not null)
EXECUTE(@postcommand)
RETURN @retval
GO
example useage:
EXEC sp_MSforeachsp @command1="PRINT '?' GRANT EXECUTE ON ? TO [superuser]"
GO
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Mar 30, 2004
Let me see if I can explain this.
I have the need to pull data from multiple tables from a DB2 system via ODBC and update or insert as needed into tables in a SQL200 DB.
Step 1.
The data from the initial parent table will need to be limited to being a set number of days old, which I have in place and working.
Step 2
The next tables data needs to be limited from the data retrieved in step 1 (I’d like to use the paprent table retrieved in step 1, that is in SQL now, rather than doing it on the DB2 side.
Step 3
The returned rows here, need to be limited to key values returned from step 2
Additional steps apply, but nearly all will be limited to the results of parent tables from the prior step.
What is the best approach to this? I really want to pull table A to SQL, and limit the next child set from Table A, that was pulled to SQL in the prior step.
I also need to do updates rather than dropping and creating the needed tables each time. Insert if no key exists, etc .etc.
What is the best approach?
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Mar 20, 2006
I've been working on this project, and had it working in MySQL, but it was badly done and couldn't last more than a few hours without growing so large that everything slowed way down. I don't expect anyone to tell me exactly what to do, just please provide an outline of what the best way to approach this in SQL Server 2005 is.
To simplify it, I have one table "Items" and another table "ItemPrices". Items has an id and a name. Each row in ItemPrices has an id for the item, a price and two datestamps (added, last updated).
On average, there's about 15,000 active items, 50% of them have new prices every couple minutes, so I'm looking at what seems like a ton of data being constantly imported. There's probably a good way to do this but I only know the bad way :)
So.. what I want to be able to do is have maybe a stored procedure (?) that takes the item name and price as parameters. (In MySQL I was using "INSERT... ON DUPLICATE KEY UPDATE")
A. If it's a new item name, it will add a row to the Items table and a row to ItemPrices
B. If it's an existing item with the same price as the current price (the most recent price for that item in ItemPrices) it will update the "last updated" date field
C. If it's a new price it will insert a row into ItemPrices for that item
Also, I want historical pricing data, but if I ever release this, 95% of the users will just be looking at current prices. I need the current prices to be very fast to query, in my MySQL version I was using something like this: "SELECT... join on lastupdated=(SELECT Max(lastupdated) FROM ItemPrices ...", after I had 300k price updates querying a list of items took like 15 seconds.. there's got to be a better way? What should I do to make this faster?
Does this make any sense? Hopefully someone can lead me in the right direction. Thank you very much!
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May 24, 2008
Hello all.
I use MDX on a cube which provides data about animal population.
The cube contains the keyfigure "ANIMALS" that takes the number of animals.
The cube has a dimension "VERSION" which is used to identify the keyfigure
as a target or an actual value (possible values: "actual" and "target")
The cube has another dimension "ZONE" for the population zones.
Possible values for zones: "A", "B", "C" and "D".
Now I want to create an MDX statement, that gives me a result row like this:
Actual number of animals (as sum of all 4 zones) in column no. 1,
Target number of animals (as sum of all 4 zones) in column no. 2,
Achieved percentage (as actual number / target number * 100) in column no. 3.
Until here my statement works and it looks like this:
WITH MEMBER [VERSION].[achieved] AS '[VERSION].[actual] / [VERSION].[target] * 100'
SELECT {[VERSION].[actual], [VERSION].[target], [VERSION].[achieved]} on COLUMNS
FROM [$MYCUBE]
WHERE ([Measures].[ANIMALS])
It surely is possible that the achieved value for all zones together is equal to or greater than 100%,
while single zones might have an achieved values less than 100%.
In order to account on this, i would like column no. 4 to display one of these words:
"ok" if none of the single zones has an achieved value smaller than 100%,
"warning" if any of the single zones has an achieved value between 96 and 99%,
"alert" if any of the single zones has an achieved value smaller than 95%.
That means, i want e.g. the word "yellow" if the lowest achieved value
of the 4 zones is between 96 and 99. I want to have "red" if the lowest value
is smaller than 95.
I am quite new to MDX and I have struggled quite a long time with this.
I would be grateful for a hint on how i have to modify / enhance my MDX statement.
Regards. Peter.
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Sep 27, 2006
I have what I feel like is a simple package I am working to create. I am teaching myself SSIS as I go along.
Source server SQL 2000 database allows NULL values in columns.
Destination Server also SQL 2000 but the database required a value in each column.
So I do a basic source select what I want. I next need to read the values and determine if null then insert a space, do some column matching and insert them into the destination sever.
I believe I should use a Derived Column and an expression ISNULL to accomplish what I want.
Maybe there is a better way. Suggestion and comment appreciated.
Ryan
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May 18, 2006
Greetings my friends
I am attempting to solve the following problem using SSIS, actually I am attempting to convert a SQL Server 2000 DTS package in to a SSIS package.
The package does the following :
1) Retrieve the maximum Price_ID (PK) from a PRICE dimension table.
2) Populate a staging table with data coming from a source system where the PRICE_ID > (Price_ID from above)
3) Update the actual DIM table with the new data help in the staging table.
For this task I want to learn the use of the Lookup component which I think is appropriate.
My questions are as follows :
If I create a global variable to hold the maximum PRICE_ID (see point 1). How do I get to use the variable in the my Data Flow Data source?!
I am totally confused... I don't even know where to start with this.
Your help would be appreciated.
Thanks SQL friends.
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Jun 21, 2006
I've been banging my head for a while now, and it is sore! :-P
I'm a best practice/Microsoft approach type of person and want to make sure I do things correctly.
I have a database, kind of like a forum.
Obviously executing multiple queries in one "batch" (stored proc) would have an impact on the performance.
Now, I would like to give a more detailed/specific error back to the caller (either by aid of error code or whatever) with such situations like...
"EditReply"
Edit reply takes the threadID, replyID and userID.
Before actually commiting the changes, it needs to check:
1) does the user exist in the database? (during the editing of the reply, perhaps the user may have been deleted before running the stored proc, who knows)
2) does the thread exist?
3) does the reply exist?
if the conditions are met, only then will it go ahead and update the database. Now that is 3 queries, and 4 statements overall to make a change to a field/table.
Obviously if one of the commands returns false, in other words if say "does the thread exist" returns 0 (thread doesnt exist) it will return back to the caller an errorcode, which they will handle in their application. Thats all fine but the question is
Am I doing this correctly? (no) - how can I improve this? What do I need to think about?
Of course I would like to give a more detailed error back to the caller (aid of errorcode designed in the application overall) instead of just "no, databases not updated".
In this situation, am I wrongly assuming that the database designers use this type of approach?
Please help, I value your feedback and suggestions. I want to improve and think of the right lines of doing these things.
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Sep 25, 2007
part 1
Declare @SQLCMD varchar(5000)
DECLARE @DBNAME VARCHAR (5000)
DECLARE DBCur CURSOR FOR
SELECT U_OB_DB FROM [@OB_TB04_COMPDATA]
OPEN DBCur
FETCH NEXT FROM DBCur INTO @DBNAME
WHILE @@FETCH_STATUS = 0
BEGIN
SELECT @SQLCMD = 'SELECT T0.CARDCODE, T0.U_OB_TID AS TRANSID, T0.DOCNUM AS INV_NO, ' +
+ 'T0.DOCDATE AS INV_DATE, T0.DOCTOTAL AS INV_AMT, T0.U_OB_DONO AS DONO ' +
+ 'FROM ' + @DBNAME + '.dbo.OINV T0 WHERE T0.U_OB_TID IS NOT NULL'
EXEC(@SQLCMD)
PRINT @SQLCMD
FETCH NEXT FROM DBCur INTO @DBNAME
END
CLOSE DBCur
DEALLOCATE DBCur
Part 2
SELECT
T4.U_OB_PCOMP AS PARENTCOMP, T0.CARDCODE, T0.CARDNAME, ISNULL(T0.U_OB_TID,'') AS TRANSID, T0.DOCNUM AS SONO, T0.DOCDATE AS SODATE,
SUM(T1.QUANTITY) AS SOQTY, T0.DOCTOTAL - T0.TOTALEXPNS AS SO_AMT, T3.DOCNUM AS DONO, T3.DOCDATE AS DO_DATE,
SUM(T2.QUANTITY) AS DOQTY, T3.DOCTOTAL - T3.TOTALEXPNS AS DO_AMT
INTO #MAIN
FROM
ORDR T0
JOIN RDR1 T1 ON T0.DOCENTRY = T1.DOCENTRY
LEFT JOIN DLN1 T2 ON T1.DOCENTRY = T2.BASEENTRY AND T1.LINENUM = T2.BASELINE AND T2.BASETYPE = T0.OBJTYPE
LEFT JOIN ODLN T3 ON T2.DOCENTRY = T3.DOCENTRY
LEFT JOIN OCRD T4 ON T0.CARDCODE = T4.CARDCODE
WHERE ISNULL(T0.U_OB_TID,0) <> 0
GROUP BY T4.U_OB_PCOMP, T0.CARDCODE,T0.CARDNAME, T0.U_OB_TID, T0.DOCNUM, T0.DOCDATE, T3.DOCNUM, T3.DOCDATE, T0.DOCTOTAL, T3.DOCTOTAL, T3.TOTALEXPNS, T0.TOTALEXPNS
my question is,
how to join the part 1 n part 2?
is there posibility?
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Aug 7, 2006
Hello,
I'm doing my best here, but need some help. I have a client that has a company list that they want searched by key word. This is exported from another program (in excel) that they want used and searched on their website.
Bad news, is each Keyword is listed with the company separately. So if a company has 5 different key words, they will be listed in the excel file 5 times.
The info I have is Name, Address, City, State, Phone, Keywords:
So example of excel is:Company A, 123 Main St, Mycity, Mystate, 123-123-1234, Green
Company A, 123 Main St, Mycity, Mystate, 123-123-1234, Furry
Company A, 123 Main St, Mycity, Mystate, 123-123-1234, Large
Company A, 123 Main St, Mycity, Mystate, 123-123-1234, Circular
Company B, 746 Sparrow Ave, Diffcity, Diffstate, 987-987-9876, Blue
Company B, 746 Sparrow Ave, Diffcity, Diffstate, 987-987-9876, Furry
Company B, 746 Sparrow Ave, Diffcity, Diffstate, 987-987-9876, Small
I am able to import this large (4.2 MB) file into a table called fctable
What i'm trying to do is write SQL scripts or queries that can insert into a Company Table and Keyword Table.
I'm trying to write this through asp.net 2.0 (so the excel file is uploaded) and have tried to write my inserts like
INSERT INTO [Company] ([Name], [address], [City], [State], [Phone]) VALUES (SELECT DISTINCT
Name, Address, City, State, Phone
FROM fctable )
But that doesn't seem to be working.
This is the only way my client can get the info to me, and it will be changed probably twice per month, so I'd hate to have to try to manipulate an excel file 24 times a year to import.
Any suggestions Appreciated
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Feb 27, 2008
Hello everyone.
I am new to.Net and here is what I have to do.
I needto update a SQL table with data coming from a XML file. I have seen some Microsoft documentation on this (the nice SQL statement that updates and inserts in the same stored procedure) but I don'tknow what is the best approach for passing my XML file to the stored procedure. The XML contains about 12 000 records, kind of phonebook info (name, email, phone).
What would be the best approach to do this? What objects should I use?
Thanks a million,
Ben
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Oct 18, 1999
Environment
NT Server 4.0 w/ SP4
SQL Server 7.0 w/ SP1
Win98 Client w/ Lotus Approach 9.5
I recently added SQL 7.0 to be a back end for my Approach front end. I transferred all the data from a dbase IV in approach to SQL. Most of the conversions worked ok. I have two big problems.
1) One particular repeat panel in Approach loses the children records of the master record. If I delete some of the records, more will appear. It's as if there is an imaginary limit of the number of records it can read in the repeat panel. I don't have this problem with any other records and children in repeat panels. I called Lotus and they don't have an answer. This is important because the children records need to be summed up so I can have a running total.
2) I original configured the clients to use the TCP/IP Netlib w/ the default port. I couldn't open enough databases so I changed to Multiprotocol. This allowed certain clients to open more databases, but others can't open additional databases. Also, after the change, the NT authentication login has had problems. I had to change to the SQL login to get all my clients back on line. Sometimes the same client can't open more than 10 databases while other times it will open 15. There is no consistent patten to when it can and can't open the additional databases.
If anyone knows how to fix either of these problems, I would greatly appreciate any advice. I'm getting tired of my boss yelling at me.
Thanks.
Keith
akumaboyz@aol.com
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May 12, 2008
I have a select statement where I need to test two values that are returned and perform a different calculation if they return null.
Basically,
if TESTA is null and TESTB is not null
return TESTB
if TESTB is null and TESTA is not null
return TESTA
ELSE if both are not null
TestA + TestB / 2 is value is returned
is this possible to do in a select statement? thanks in advance.
See select statement below:
Select S.StudentDimKey,
(select ISNULL(R.Score, NULL) from CLT_StudentAssessmentRawFact R, CLT_LessonPlanDim L where L.LessonPlanKey = 1 and L.LessonPlanDimKey = R.LessonPlanDimKey and StudentDimKey = S.StudentDimKey) as TESTA,
(select ISNULL(R.Score, NULL) from CLT_StudentAssessmentRawFact R, CLT_LessonPlanDim L where L.LessonPlanKey = 2 and L.LessonPlanDimKey = R.LessonPlanDimKey and StudentDimKey = S.StudentDimKey) as TESTB,
from CLT_StudentPlacementFact P, CLT_StudentDim S, CLT_ClassHierarchyDim H, CLT_StudentClassFact C
where P.StudentDimKey = S.StudentDimKey
and H.ClassHierarchyDimKey = C.ClassHierarchyDimKey
and S.StudentDimKey = C.StudentDimKey
and S.StatusCode = 'A'
and S.CurrentRecord = 1
and S.SchoolID = 87577
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Apr 25, 2008
Lets say I have a dynamic table of 10 to 30 varchar(255) columns that I do not know the names of.
Each of these columns is updated with either an 'OK' or an error msg.
Here's the issue. I have a Status column (varchar(MAX)) which I want to be the concatenated sum of all the other columns. I'd like to do this via a trigger because the way I understand it, theres no way a trigger can skip over another update/trigger and write the wrong 'Status' value.
Example Row 1:
RandomColName1 = "1||Access Denied"
RandomColName2 = "0||OK"
RandomColName3 = "2||ID10T Error at Kbrd"
Status = "[RandomColName1] Access Denied | [RandomColName3] = "ID10T Error at Kbrd"
Example Row 2:
RandomColName1 = "0||OK"
RandomColName2 = "0||OK"
RandomColName3 = "0||OK"
Status = "0||OK"
The rules:
1. There is no chance of someone updating the same column at the same time.
2. There's a good chance that other columns in the same row will be updated at the same time.
3. Sometimes a column can be updated every 5 secs.
4. About 100 to 5000 Rows
I'm a SQL newb and this would be my first trigger to write (lol) but I feel if it could be done without causing a DEADLOCK then it should be done this way. Unless someone with more experience can shed some light
With up to 300 .net clients over fast and slow links, I don't want to xfer the whole 5000 row / 50 column table back to the app and have it weed it out, especially if the client only needs 100 of the rows. On the same token, I don't want to make an individual call back to the SQL server should the client need 4000 rows.
Thanks for the help!
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Jul 4, 2007
I have a scenario in mind and was wondering if anyone had any suggestions on an approach.
Lets say I have a dataset where I have captured various attributes about blade servers in a rack. I have internal temperature, fan speed, disk reads, cpu temperature and failure events. Each of these are continuous variables except for the failure event, which has only two states, 'true' or 'false' which indicates whether a failure occurred at that point in time.
The table looks like this:
MachineID
Timestamp
Temperature
FanSpeed
Reads
CPUTemp
Failure
At the time of failure, only the MachineID, Timestamp and Failure values will be populated in the table. The failures at this time are not categorized or discriminated from each other in any way although they will be in the future. We're looking to use a mining algorithm to determine which variable is the best predictor of failure, or combination of variables. What do you think is the right approach? How might this approach change once the failures do become categorized and differentiated?
Thanks,
Frank
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Aug 13, 2007
Background
I use four database connections strings.
I have about 30 packages that will use one or more of the connection stings.
I store the connection strings in XML configuration files.
I know that I can share configuration files across packages. Should I ?
Have one configuration file with all 4 connection strings? If I use this approach will I get errors in the packages that only use 1 of the connection strings OR
Create four separate configuration files (CnnString1.dtsconfig, CnnString2.dtsconfig, CnnString3.dtsconfig, CnnString4.dtsconfig) and use the appropriate ones for each package
Take another approach
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May 23, 2008
Let me use a simplied example for what I'm trying to do.
Say, I have the following source tables.
T_EmpDept
Emp_Name, Dept_Name
John , IT
Mary , IT
Ted , HR
T_Employee
EmpID, Emp_Name
1 , John
2 , Mary
3 , Ted
T_Dept
DeptID, Dept_Name
1 , IT
2 , HR
Now, I wan to populate a target table that looks like
T_Target
EmpID, DeptID
1 , 1
2 , 1
3 , 2
So, it's basically a lookup by name and translated to the appropriate keys.
The way I've done this before, is I do one lookup at a time in serial (one data stream) and get the keys I need. But I want to do them in parallel (split the data stream in two), which I believe involves a Multicast Task and some sort of a Merge Task. I used to shy away from the parallel lookup because I never really understood how to bring the two data streams back together.
So, the question I have is this. Are Multicast and Merge task the right tasks to use for this? I don't want to go researching something that may not be appropriate.
Lastly, if someone has a link that can lay this out for me, I would appreciate it.
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Oct 9, 2007
I don't have much background with SSIS or SQLServer or development for that matter. I was thrust in to this and I apologize if my questions are not up to snuff in any way.
I have built an SSIS package based on the import/export wizard and have customized it by adding a For Each Loop container for processing multiple source data files and it works great so far but I need to add some advanced functionality to make it more flexible. I'm having some problems with the best way to enhance the solution and I'm getting frustrated with variables and expressions, which is what I think I need to use. Hopefull what I need is something that's doable.
The package processes mutliple source files using the For Each Loop. The data is stored in a destination table that is dropped and recreated each time. I've also added a couple of CREATE INDEX statements to the source SQL.
I need to make the SQL DROP, CREATE TABLE and INDEX statements dynamic based on part of the filename string. I'm capturing the filename in the FOR EACH container using Variable Mapping. What I need to do is parse out part of the string from the filename and use it in the SQL statements. An example would be CREATE TABLE XXX_[stringvar] where [string] comes from the variable mapping done in the For Each loop.
My thinking was to setup a new variable within the scope of the SSIS package and enable Evaluate as Expression and then build an expression for the varible where I parse out the string from the filename variable that already exists. So if the filename was filename.filetype and I needed the last 4 characters from the filename the string value would be whatever characters were in 'name' each time. But there isn't an expression builder editor built in to the variable properties expression element, so I'm not clear that I can actually create a variable in SSIS and then have it's value be set using an expression. It seems to me that if this was doable, then the expression builder I've seen elsewhere in SSIS would be visable.
Then I was hoping I could edit the SQL behind the DROP and CREATE statements where I've hard coded the table name and insert the variable right in the SQL. My SQL isn't that strong and I don't know how to work with variables but I was thinking the SQL would look like CREATE TABLE XXX_@[stringvar].... I believe another approach would be to setup another string variable for the entire SQL statement and build the statement string dynamically. But I don't know if this is necessary or better.
Anyway, I hope someone can help and that my original post is clear enough.
Thanks
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