Case Stmt Returns Duplicate Result
Nov 28, 2007
Hi there,
The following is my table whereby i have joined projects table with issue table (this is 1 to many relationship).
I have the following query:
SELECT
odf.mbb_sector sectorid,
SUM(case when odf.mbb_projecttype = 'lkp_val_appl' then 1 else 0 end) total_appl,
SUM(case when odf.mbb_projecttype = 'lkp_val_infrastructure' then 1 else 0 end) total_infra,
SUM(case when odf.mbb_projecttype = 'lkp_val_eval' then 1 else 0 end) total_eval,
SUM(case when odf.mbb_projecttype = 'lkp_val_subproject' then 1 else 0 end) total_subprj,
SUM(case when odf.mbb_projecttype = 'lkp_val_nonit' then 1 else 0 end) total_nonit,
SUM(case when odf.mbb_projecttype = 'lkp_val_adhocrptdataextract' or
odf.mbb_projecttype = 'lkp_val_productionproblem' or
odf.mbb_projecttype = 'lkp_val_maintwoprogchange' then 1 else 0 end) total_others,
COUNT(distinct prj.prid) total_prj
FROM
PRJ_PROJECTS AS PRJ,
SRM_PROJECTS AS SRM,
ODF_CA_PROJECT AS ODF
LEFT JOIN RIM_RISKS_AND_ISSUES AS RRI ON RRI.pk_id = odf.id
WHERE
prj.prid = srm.id
AND srm.id = odf.id
AND srm.is_active =1
AND odf.mbb_projecttype not in ('lkp_val_budget','lkp_val_itpc')
AND odf.mbb_funcunit = 'lkp_val_operation'
GROUP BY
odf.mbb_sector
which returns me the following result :
.
The problem is at the lkp_val_infosystem where it returns 3 instead of 1 in the total_infra column. How do I correct my case stmt to return the correct no of projects breakdown by different project type? Currently, only the total_prj which returns correct data.
Thanks
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Aug 2, 2007
I am trying to code a WHERE xxxx IN ('aaa','bbb','ccc') requirement but it the return values for the IN keyword changes according to another column, thus the need for a CASE function.
WHERE GROUP.GROUP_ID = 2 AND DEPT.DEPT_ID = 'D' AND WORK_TYPE_ID IN ( CASE DEPT_ID WHEN 'D' THEN 'A','B','C' <---- ERROR WHEN 'F' THEN 'C','D ELSE 'A','B','C','D' END )
I kept on getting errors, like
Msg 156, Level 15, State 1, Line 44Incorrect syntax near the keyword 'WHERE'.
which leads me to assume that the CASE ... WHEN ... THEN statement does not allow mutiple values for result expression. Is there a way to get the SQL above to work or code the same logic in a different manner in just one simple SQL, and not a procedure or T-SQL script.
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Nov 5, 2007
I have a view where I'm using a series of conditions within a CASE statement to determine a numeric shipment status for a given row. In addition, I need to bring back the corresponding status text for that shipment status code.
Previously, I had been duplicating the CASE logic for both columns, like so:
Code Block...beginning of SQL view...
shipment_status =
CASE
[logic for condition 1]
THEN 1
WHEN [logic for condition 2]
THEN 2
WHEN [logic for condition 3]
THEN 3
WHEN [logic for condition 4]
THEN 4
ELSE 0
END,
shipment_status_text =
CASE
[logic for condition 1]
THEN 'Condition 1 text'
WHEN [logic for condition 2]
THEN 'Condition 2 text'
WHEN [logic for condition 3]
THEN 'Condition 3 text'
WHEN [logic for condition 4]
THEN 'Condition 4 text'
ELSE 'Error'
END,
...remainder of SQL view...
This works, but the logic for each of the case conditions is rather long. I'd like to move away from this for easier code management, plus I imagine that this isn't the best performance-wise.
This is what I'd like to do:
Code Block
...beginning of SQL view...
shipment_status =
CASE
[logic for condition 1]
THEN 1
WHEN [logic for condition 2]
THEN 2
WHEN [logic for condition 3]
THEN 3
WHEN [logic for condition 4]
THEN 4
ELSE 0
END,
shipment_status_text =
CASE shipment_status
WHEN 1 THEN 'Condition 1 text'
WHEN 2 THEN 'Condition 2 text'
WHEN 3 THEN 'Condition 3 text'
WHEN 4 THEN 'Condition 4 text'
ELSE 'Error'
END,
...remainder of SQL view...
This runs as a query, however all of the rows now should "Error" as the value for shipment_status_text.
Is what I'm trying to do even currently possible in T-SQL? If not, do you have any other suggestions for how I can accomplish the same result?
Thanks,
Jason
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Oct 23, 2007
Hi,
I'm having a little trouble with the following code:
SELECT DISTINCT cd1.*, cd2.*
FROM Table1 cd1 LEFT JOIN Table2 cd2
ON cd1.RegNr=cd2.RegNr
WHERE cd1.RegNr = $RegNr
I want it to return the 2 rows that is present in the tables but it returns 4.
1262007-10-20 10:14:00
1262007-10-20 10:14:00
1262007-10-20 10:17:00
1262007-10-20 10:17:00
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Oct 25, 2004
We are running the following query, which has a unique index on Table_2 (col1 and sys1), and Column col1 from Table_1 is unique.
select top 100 s.*, x.col1
from Table_1 s
left outer join Table_2 x
on x.col1 = s.col1 and x.sys1 = 'SYSTEM0'
Unfortunately this query returns duplicate rows. And every time the result is different
But once we dbcc dbreindex the unique index on Table_2, the result will not have any dups.
Any ideas?
Thanks
Steve
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May 10, 2006
My stored procedure works perfectly when I run Query Analyser, but when I run my VB program I get the eror: I get the message : An SqlParameter with ParameterName '@total' is not contained by this SqlParameterCollection.
Here is my stored Proc and my VB program is right below
I- Stored Proc:
CREATE PROCEDURE dbo.totalsub @account bigint,@total bigint outputASselect total=sum(SubPhnNmbr) from tblsub where SubAccNmbr=@accountreturnGO
II- And my pogram in VB is:
Dim totsub As Int64 Dim cm As New SqlCommand Dim cn As New MyConnection cn.open 'my connection is defined by me don't worry about it cm.CommandType = CommandType.StoredProcedure cm.CommandText = "totalsub" cm.Connection = cn Dim pm As SqlParameter pm = cm.Parameters.Add(New System.Data.SqlClient.SqlParameter("@Account", System.Data.SqlDbType.BigInt)) pm.Value = 100000165 pm = cm.Parameters.Add(New System.Data.SqlClient.SqlParameter("total", System.Data.SqlDbType.BigInt, 4)) pm.Direction = ParameterDirection.Output totsub = cm.Parameters("total").Value cm.ExecuteScalar() totsub = cm.Parameters("total").Value
I also tried using @total instead of total and I tried ParameterDirection.ReturmValue instead of ParameterDirection.Output
No Luck, someone pls can help
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Jul 13, 2015
I am facing a problem that following query give me different result whenever I execute the query, it returns me same number of records but not all the rows are same everytime it is executed.
Select[Field1]
From
(
SelectRow_number() Over(Partition By [Field2], [Field3] Order By [Field2], [Field3], [Field4] Desc) ID, *
From[dbo].[Table1]
) A
WhereID > 1
OrderBy [Field1]
Those highlighted in yellow colours are duplicate records, I need to remove one of them.
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Mar 6, 2007
Hi there everyone. I have a stored procedure called “PagingTable� that I use for performing searches and specifying how many results to show per ‘page’ and which page I want to see. This allows me to do my paging on the server-side (the database tier) and only the results that actually get shown on the webpage fly across from my database server to my web server. The code might look something like this:
strSQL = "EXECUTE PagingTable " & _
"@ItemsPerPage = 10, " & _
"@CurrentPage = " & CStr(intCurrentPage) & ", " & _
"@TableName = 'Products', " & _
"@UniqueColumn = 'ItemNumber', " & _
"@Columns = 'ItemNumber, Description, ListPrice, QtyOnHand', " & _
"@WhereClause = '" & strSQLWhere & "'"
The problem is the stored procedure actually returns two result sets. The first result set contains information regarding the total number of results founds, the number of pages and the current page. The second result set contains the data to be shown (the columns specified). In ‘classic’ ASP I did this like this.
'Open the recordset
rsItems.Open strSQL, conn, 0, 1
'Get the values required for drawing the paging table
intCurrentPage = rsItems.Fields("CurrentPage").Value
intTotalPages = rsItems.Fields("TotalPages").Value
intTotalRows = rsItems.Fields("TotalRows").Value
'Advance to the next recordset
Set rsItems = rsItems.NextRecordset
I am trying to do this now in ASP.NET 2.0 using the datasource control and the repeater control. Any idea how I can accomplish two things:
A) Bind the repeater control to the second resultset
B) Build a “pager� of some sort using the values from the first resultset
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Nov 23, 2006
/*Subject: How to build a procedure that returns differentnumbers of columns as a result based on a parameter.You can copy/paste this whole post in SQL Query Analyzeror Management Studio and run it once you've made surethere is no harmful code.Currently we have several stored procedures which finalresult is a select with several joins that returns manycolumns (150 in one case, maybe around 50 the average).We have analyzed our application and found out that mostof the time not all the columns are used. We haveidentified 3 different sets of columns needed indifferent parts of the application.Let's identify and name these sets as:1- simple set, return the employee list for example2- common set, return the employee information (whichinclude the simple set)3- extended set, return the employee information (whichinlude the common set which itself includes the simpleset) + additional information from other tables, maybeeven some SUM aggregates and so on (I don't know forexample, how much sales the employee did so far).So the bigger sets contain the smaller ones. Please keepreading all the way to the bottom to better understandtechnically what we are trying.Here is a code sample of how our current procedureswork. Please note that the passing parameter we can eitherpass a Unique Identifier (PK) to retrieve a single record,or if we pass for example -1 or NULL we retrieve all theemployee records.*/create table a ( apk int primary key, af1 int, af2 int, af3 int, af4int, af5 int, af6 int)create table b ( bpk int primary key, bf1 int, bf2 int, bf3 int, bf4int, bf5 int, bf6 int)create table c ( cpk int primary key, cf1 int, cf2 int, cf3 int, cf4int, cf5 int, cf6 int)create table d ( dpk int primary key, df1 int, df2 int, df3 int, df4int, df5 int, df6 int)insert a values (1,1111,1112,1113,1114,1115,1116)insert a values (2,1211,1212,1213,1214,1215,1216)insert a values (3,1311,1312,1313,1314,1315,1316)insert a values (4,1411,1412,1413,1431,1415,1416)insert a values (5,1511,1512,1513,1514,1515,1516)insert a values (6,1611,1612,1613,1614,1615,1616)insert b values (1,2111,2112,2113,2114,2115,2116)insert b values (2,2211,2212,2213,2214,2215,2216)insert b values (3,2311,2312,2313,2314,2315,2316)insert b values (4,2411,2412,2413,2431,2415,2416)insert b values (5,2511,2512,2513,2514,2515,2516)insert b values (6,2611,2612,2613,2614,2615,2616)insert c values (1,3111,3112,3113,3114,3115,3116)insert c values (2,3211,3212,3213,3214,3215,3216)insert c values (3,3311,3312,3313,3314,3315,3316)insert c values (4,3411,3412,3413,3431,3415,3416)insert c values (5,3511,3512,3513,3514,3515,3516)insert c values (6,3611,3612,3613,3614,3615,3616)insert d values (1,4111,4112,4113,4114,4115,4116)insert d values (2,4211,4212,4213,4214,4215,4216)insert d values (3,4311,4312,4313,4314,4315,4316)insert d values (4,4411,4412,4413,4431,4415,4416)insert d values (5,4511,4512,4513,4514,4515,4516)insert d values (6,4611,4612,4613,4614,4615,4616)gocreate procedure original_proc @pk int asif @pk = -1set @pk = nullselecta.af1, a.af2, a.af3, a.af4, b.bf1, b.bf2, b.bf3, b.bf4, c.cf1, c.cf2,c.cf3, c.cf4, d.df1, d.df2, d.df3, d.df4fromajoin b on a.apk = b.bpkjoin c on b.bpk = c.cpkjoin d on c.cpk = d.dpkwherea.apk = ISNULL(@pk, a.apk)goexec original_proc 1go/*Currently the above SP is a single SP that is basicallyreturning ALL possible needed data. However most of thetime we might need to call and retrieve a simple employeelist.So we thought about modifying the stored procedure byadding an extra parameter that will indicate which setof columns to return.For modifying the stored procedure in order to get avariable name of columns returned and avoidingrepeating code, we built 4 objects: the storedprocedure being called, one table function and 2 views.One table function so that we are able to pass a parameter.The views since they do not accept parameters they arealways joined at least with the inline table function.The stored procedure generates in its body a dynamicSQL statement, where it queries the table function andthe views, depending which set is required. Here is acode sample of our current design (you need to run theprevious code in order for this to work).*/create function _1_set(@pk int)returns tableas return(select a.apk, a.af1, a.af2, a.af3, a.af4, b.bf1, b.bf2from ajoin b on a.apk = b.bpkwhere a.apk = ISNULL(@pk, a.apk))gocreate view _2_set asselect b.bpk, b.bf3, b.bf4, c.cf1, c.cf2from bjoin c on b.bpk = c.cpkgocreate view _3_set asselect c.cpk, c.cf3, c.cf4, d.df1, d.df2, d.df3, d.df4from cjoin d on c.cpk = d.dpkgocreate procedure new_proc @pk int, @set int asdeclare @sql nvarchar(4000)if @pk = -1set @pk = nullset @sql = 'select * from _1_set(@pk) fs 'if @set 1set @sql = @sql + 'join _2_set ss on fs.apk = ss.bpk 'if @set 2set @sql = @sql + 'join _3_set ts on ss.bpk = ts.cpk 'exec sp_executesql @sql, N'@pk int', @pkgoexec new_proc 1, 3go/*For executing the new procedure, we pass parameter 1for the smaller set, 2 for the medium size set or 3for the complete set.For example when we want to retrieve the common setwe pass the Unique Identifier of the employee to theSP and then we pass the type of set we want to useas the second parameter (1 for simple set, 2 forcommon set and 3 for extended set).The SP has the IF and dynamic SQL to add more JOINs.We would like to know what you think of this approachand if you know a simpler way of doing it.For cleaning up the test objects run the following code.*/drop procedure original_procdrop procedure new_procdrop function _1_setdrop view _2_setdrop view _3_setdrop table adrop table bdrop table cdrop table dAs always I would appreciate any feedback, opinion,comments, ideas and suggestions.Thank you
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Mar 23, 2006
Hi,
we are facing problem in executing a stored procedure from Java Session Bean,
coding is below.
pst = con.prepareStatement("EXEC testProcedure ?", ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_READ_ONLY);
pst.setString(1, "IN");
//
rs = pst.executeQuery();
rs.last();
System.out.println(" Row Number "+rs.getRow());
rs.beforeFirst();
while(rs.next())
{
System.out.println(" Procedure is "+rs.getString(1));
}
same sp working perfectly with SQL Server 2000
am getting a error message
com.microsoft.sqlserver.jdbc.SQLServer
Exception: A server cursor cannot be opened on the given statement or statements
. Use a default result set or client cursor.
If a SP doesnt have a temp table, then there is no issue, SP executes perfectly, but if a SP has a temp table, this error occurs.
SP :
create proc testProcedure
@countrCode varchar(3)
as
select countryname INTO #TMPCOU from country where countryCode = @countrCode
SELECT COUNTRYNAME FROM #TMPCOU
Its really very urgent. Please help me...!
Rgds,
Venkatesh.
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Feb 8, 2008
Hello,
I have a business rule that says if PROD = ''XCDD' and ProductRollUp = 'XCSH' Then BillingType = 'Express Cash' or 'Payment Services'.
Is there a way to represent that rule with a CASE statement?
Thank you for your help!
cdun2
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May 30, 2007
Working in Sql Server 2005,got 3 different table.Need to fetch the list of persons.A person can belong to different categories.When i am using inner join
on tables i am getting the duplicate rows because a perosn can belong to different categories.I want that there should be only onoe
row for the person and the different categories he belongs to can come up in single field as comma sepatated string
Now the results are like this:
firstname lastname adress category
abc xyz aaa a
abc xyz aaa b
abc xyz aaa c
I want like below:
abc xyz aaa a,b,c
I am thinking of using cursors in the stored procedure.Can you provide me the solution of this including the stored procedure..
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May 7, 2012
I am using SLQ Server 2008 R2. The database was designed by another company.
I have two tables: Client and Client_Location. In the Client table the pk is Client_ID. There is also a unique key: sys_Client_ID. Both the Client_ID and the sys_Client_ID fields exist as a foreign keys in the Client_Location table. However, the fields are not noted as unique in the Client_Location table. There are two fields in the Client_Location table that determine when the address was effective. They are from_dt and end_dt.
Multiple records have been loaded into the Client_Location table to track old as well as current addresses of clients.
I'm trying to run a report that will pull clients with a plan_id constraint from the Client table and join the Client_Location table to retrieve the current address of these clients.
My SQL is:
select distinct (a.client_id), a.cli_last AS Last_Name,
a.cli_first AS First_Name, a.cli_middle AS Mid_Init,
b.city AS City, b.county AS County, b.state AS State
from ECBH.dbo.tbl_Client a inner join ECBH.dbo.tbl_Client_Location b
on a.client_id = b.client_id
inner join ECBH.dbo.tbl_client_insurance c
on a.client_id = c.client_id
inner join ECBH_TEST.dbo.tbl_GEF_County d
on b.county = d.COUNTY_NAME
where c.plan_id = 4
order by a.cli_last, a.cli_first
Because multiple records exist in the Client_Location table, the result set has duplicates. How can I pull only the results where the from_dt is most recent?
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Aug 31, 2007
How do I automatically assign a new cardcode-number? (according to the following formula: highest existing number + 1)
Scenario:
-There are two types of business partners: Customers and Suppliers.
-Customers have the value 'C' in the colomn CardType.
-Suppliers have the value 'S' in the colomn CardType.
-Customers have the following syntax 'C123456' in the colomn CardCode.
-Suppliers have the following syntax 'S123456' in the colomn CardCode.
-Existing CardCode-values in the DB for the Customers: C000001 - C100599.
-Existing CardCode-values in the DB for the Suppliers: S000001 - S200199.
The idea is that when a user creates a new business partner, the CardCode should be automatically filled when a new assigned number (highest existing number + 1), according to the value that is selected in CardType (either the letter 'C' or 'S').
What's been done so far:
SELECT top 1
(CASE
WHEN CardType='C' THEN (SELECT top 1 'C' + '' + cast((substring(T0.CardCode, 2, 7) + 1) as varchar) as [nummer]
FROM OCRD T0
WHERE T0. CardCode like 'C%' AND T0. CardType='C'
order BY T0.CardCode desc FOR BROWSE)
WHEN CardType='S' THEN (SELECT top 1 'S' + '' + cast((substring(T0.CardCode, 2, 7) + 1) as varchar) as [nummer]
FROM OCRD T0
WHERE T0. CardCode like 'S%' AND T0. CardType='S'
order BY T0.CardCode desc FOR BROWSE)
END)
FROM OCRD T0
The current result:
The result that it gives is 'C100600'.
The problem however is that it always gives this result and does not take into account what has been selected in CardType.
When I add the following: "order BY T0.CardCode desc FOR BROWSE" it gives the result 'S200200'.
So, what does work is that it takes the highest existing value and adds 1. But what doesn't work is the taking account what value is selected in CardType.
Does anyone know how I can make this work?
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Aug 13, 2012
Example:
Select StoreId from tblStores
S1
S2
S3
S4
I want to display a more friendly name. I have been using a case statement:
select case
WHEN storeId = 'S1' THEN 'NY Store'
WHEN storeId = 'S2' THEN 'CA Store'
...
end AS StoreName
If I am doing a simple 1:1 mapping like that, is there a better way than using a case statement (without creating/modifying tables)?
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Dec 28, 2007
How to get the CASE results highlighted in BOLD into this equation; "(LogOut - LogIn) + (LunchBreak) -(AMBreak) + (PMBreak) AS TimeWorked" ?
Thank you.
CREATE VIEW dbo.vwu_ReportViewASSELECT EmployeeID , LastName , FirstName , LocationCode , UserID , Today , Login , AMBreakOut , AMBreakIn , CASE WHEN ISNULL(DATEDIFF(Minute, AMBreakOut, AMBreakIn),0) >= 0 AND ISNULL(DATEDIFF(Minute, AMBreakOut, AMBreakIn),0) <= 19 THEN '0' WHEN ISNULL(DATEDIFF(Minute, AMBreakOut, AMBreakIn),0) >= 20 AND ISNULL(DATEDIFF(Minute, AMBreakOut, AMBreakIn),0) <= 34 THEN '15' WHEN ISNULL(DATEDIFF(Minute, AMBreakOut, AMBreakIn),0) >= 35 AND ISNULL(DATEDIFF(Minute, AMBreakOut, AMBreakIn),0) <= 49 THEN '30' WHEN ISNULL(DATEDIFF(Minute, AMBreakOut, AMBreakIn),0) > = 50 AND ISNULL(DATEDIFF(Minute, AMBreakOut, AMBreakIn),0) <= 64 THEN '45' ELSE '60' END AS AMBreak , LunchOut , LunchIn , CASE WHEN ISNULL(DATEDIFF(Minute, LunchOut, LunchIn),0) >= 0 AND ISNULL(DATEDIFF(Minute, LunchOut, LunchIn),0) <= 66 THEN '0' WHEN ISNULL(DATEDIFF(Minute, LunchOut, LunchIn),0) >= 67 AND ISNULL(DATEDIFF(Minute, LunchOut, LunchIn),0) <= 81 THEN '15' WHEN ISNULL(DATEDIFF(Minute, LunchOut, LunchIn),0) >= 82 AND ISNULL(DATEDIFF(Minute, LunchOut, LunchIn),0) <= 96 THEN '30' WHEN ISNULL(DATEDIFF(Minute, LunchOut, LunchIn),0) >= 97 AND ISNULL(DATEDIFF(Minute, LunchOut, LunchIn),0) <= 111 THEN '45' WHEN ISNULL(DATEDIFF(Minute, LunchOut, LunchIn),0) >= 112 AND ISNULL(DATEDIFF(Minute, LunchOut, LunchIn),0) <= 126 THEN '60' ELSE '75' END AS LunchBreak, PMBreakOut , PMBreakIn , CASE WHEN ISNULL(DATEDIFF(Minute, PMBreakOut, PMBreakIn),0) >= 0 AND ISNULL(DATEDIFF(Minute, PMBreakOut, PMBreakIn),0) <= 19 THEN '0' WHEN ISNULL(DATEDIFF(Minute, PMBreakOut, PMBreakIn),0) >= 20 AND ISNULL(DATEDIFF(Minute, PMBreakOut, PMBreakIn),0) <= 34 THEN '15' WHEN ISNULL(DATEDIFF(Minute, PMBreakOut, PMBreakIn),0) >= 35 AND ISNULL(DATEDIFF(Minute, PMBreakOut, PMBreakIn),0) <= 49 THEN '30' WHEN ISNULL(DATEDIFF(Minute, PMBreakOut, PMBreakIn),0) >= 50 AND ISNULL(DATEDIFF(Minute, PMBreakOut, PMBreakIn),0) <= 64 THEN '45' ELSE '60' END AS PMBreak , Logout , Comments , LoginLogon , AMBreakOutLogon , AMBreakInLogon , LunchOutLogon , LunchInLogon , PMBreakOutLogon , PMBreakInLogon , LogoutLogon ,(LogOut - LogIn) + (LunchBreak) -(AMBreak) + (PMBreak) AS TimeWorked
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Dec 10, 2013
I'm new to SQL Server and would like to add a calculated column to this query from the report writer in our ERP system based on the NextFreq case statement result.
Basically, I want to create a column called service with result as follows:
If IV.meter > NextFreq then the result should be 'OVERDUE'
If (NextFreq - IV.meter) <50 then the result should be 'DUE SOON'
Otherwise the result should be 'NOT DUE'
This is the code from the current report writer query:
Select IV.item, IV.meter, isnull(wt.name,0)as name, case when whh.meterstop is null then 0 end meterstop, whh.rejected, Case when cast(meterstop as int) > 0 then cast(meterstop as int) when meterstop is null then isnull(IV.meter,0) else isnull(IV.meter,0) end EndMeter, ISNULL(CAST(SUBSTRING(wt.name,1,4)as int),0) as LastFreq,
case when whh.rejected = 1 then ISNULL(CAST(SUBSTRING(wt.name,1,4)as int),0) when ISNULL(CAST(SUBSTRING(wt.name,1,4)as int),0) = 0 then 100 when ISNULL(CAST(SUBSTRING(wt.name,1,4)as int),0) = 100
[Code] ....
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Jan 28, 2008
Hi,
Please help me with an SQL Query that fetches all the records from the three tables but a unique record for each forum and topicid with the maximum lastpostdate. I have to bind the result to a GridView.Please provide separate solutions for SqlServer2000/2005.
I have three tables namely – Forums,Topics and Threads in SQL Server2000 (scripts for table creation and insertion of test data given at the end). Now, I have formulated a query as below :-
SELECT ALL f.forumid,t.topicid,t.name,th.author,th.lastpostdate,(select count(threadid) from threads where topicid=t.topicid) as NoOfThreads
FROM
Forums f FULL JOIN Topics t ON f.forumid=t.forumid
FULL JOIN Threads th ON t.topicid=th.topicid
GROUP BY t.topicid,f.forumid,t.name,th.author,th.lastpostdate
ORDER BY t.topicid ASC,th.lastpostdate DESC
Whose result set is as below:-
forumid
topicid
name
author
lastpostdate
NoOfThreads
1
1
Java Overall
x@y.com
2008-01-27 14:48:53.000
2
1
1
Java Overall
a@b.com
2008-01-27 14:44:29.000
2
1
2
JSP
NULL
NULL
0
1
3
EJB
NULL
NULL
0
1
4
Swings
p@q.com
2008-01-27 15:12:51.000
1
1
5
AWT
NULL
NULL
0
1
6
Web Services
NULL
NULL
0
1
7
JMS
NULL
NULL
0
1
8
XML,HTML
NULL
NULL
0
1
9
Javascript
NULL
NULL
0
2
10
Oracle
NULL
NULL
0
2
11
Sql Server
NULL
NULL
0
2
12
MySQL
NULL
NULL
0
3
13
CSS
NULL
NULL
0
3
14
FLASH/DHTLML
NULL
NULL
0
4
15
Best Practices
NULL
NULL
0
4
16
Longue
NULL
NULL
0
5
17
General
NULL
NULL
0
On modifying the query to:-
SELECT ALL f.forumid,t.topicid,t.name,th.author,th.lastpostdate,(select count(threadid) from threads where topicid=t.topicid) as NoOfThreads
FROM
Forums f FULL JOIN Topics t ON f.forumid=t.forumid
FULL JOIN Threads th ON t.topicid=th.topicid
GROUP BY t.topicid,f.forumid,t.name,th.author,th.lastpostdate
HAVING th.lastpostdate=(select max(lastpostdate)from threads where topicid=t.topicid)
ORDER BY t.topicid ASC,th.lastpostdate DESC
I get the result set as below:-
forumid
topicid
name
author
lastpostdate
NoOfThreads
1
1
Java Overall
x@y.com
2008-01-27 14:48:53.000
2
1
4
Swings
p@q.com
2008-01-27 15:12:51.000
1
I want the result set as follows:-
forumid
topicid
name
author
lastpostdate
NoOfThreads
1
1
Java Overall
x@y.com
2008-01-27 14:48:53.000
2
1
2
JSP
NULL
NULL
0
1
3
EJB
NULL
NULL
0
1
4
Swings
p@q.com
2008-01-27 15:12:51.000
1
1
5
AWT
NULL
NULL
0
1
6
Web Services
NULL
NULL
0
1
7
JMS
NULL
NULL
0
1
8
XML,HTML
NULL
NULL
0
1
9
Javascript
NULL
NULL
0
2
10
Oracle
NULL
NULL
0
2
11
Sql Server
NULL
NULL
0
2
12
MySQL
NULL
NULL
0
3
13
CSS
NULL
NULL
0
3
14
FLASH/DHTLML
NULL
NULL
0
4
15
Best Practices
NULL
NULL
0
4
16
Longue
NULL
NULL
0
5
17
General
NULL
NULL
0 I want all the rows from the Forums,Topics and Threads table and the row with the maximum date (the last post date of the thread) as shown above.
The scripts for creating the tables and inserting test data is as follows in an already created database:-
if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[FK__Topics__forumid__79A81403]') and OBJECTPROPERTY(id, N'IsForeignKey') = 1)
ALTER TABLE [dbo].[Topics] DROP CONSTRAINT FK__Topics__forumid__79A81403
GO
if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[FK__Threads__topicid__7C8480AE]') and OBJECTPROPERTY(id, N'IsForeignKey') = 1)
ALTER TABLE [dbo].[Threads] DROP CONSTRAINT FK__Threads__topicid__7C8480AE
GO
if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[Forums]') and OBJECTPROPERTY(id, N'IsUserTable') = 1)
drop table [dbo].[Forums]
GO
if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[Threads]') and OBJECTPROPERTY(id, N'IsUserTable') = 1)
drop table [dbo].[Threads]
GO
if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[Topics]') and OBJECTPROPERTY(id, N'IsUserTable') = 1)
drop table [dbo].[Topics]
GO
CREATE TABLE [dbo].[Forums] (
[forumid] [int] IDENTITY (1, 1) NOT NULL ,
[name] [varchar] (255) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL ,
[description] [varchar] (255) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL
) ON [PRIMARY]
GO
CREATE TABLE [dbo].[Threads] (
[threadid] [int] IDENTITY (1, 1) NOT NULL ,
[topicid] [int] NOT NULL ,
[subject] [varchar] (100) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL ,
[replies] [int] NOT NULL ,
[author] [varchar] (100) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL ,
[lastpostdate] [datetime] NULL
) ON [PRIMARY]
GO
CREATE TABLE [dbo].[Topics] (
[topicid] [int] IDENTITY (1, 1) NOT NULL ,
[forumid] [int] NULL ,
[name] [varchar] (255) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL ,
[description] [varchar] (255) COLLATE SQL_Latin1_General_CP1_CI_AS NULL
) ON [PRIMARY]
GO
ALTER TABLE [dbo].[Forums] ADD
PRIMARY KEY CLUSTERED
(
[forumid]
) ON [PRIMARY]
GO
ALTER TABLE [dbo].[Threads] ADD
PRIMARY KEY CLUSTERED
(
[threadid]
) ON [PRIMARY]
GO
ALTER TABLE [dbo].[Topics] ADD
PRIMARY KEY CLUSTERED
(
[topicid]
) ON [PRIMARY]
GO
ALTER TABLE [dbo].[Threads] ADD
FOREIGN KEY
(
[topicid]
) REFERENCES [dbo].[Topics] (
[topicid]
)
GO
ALTER TABLE [dbo].[Topics] ADD
FOREIGN KEY
(
[forumid]
) REFERENCES [dbo].[Forums] (
[forumid]
)
GO
------------------------------------------------------
insert into forums(name,description) values('Developers','Developers Forum');
insert into forums(name,description) values('Database','Database Forum');
insert into forums(name,description) values('Desginers','Designers Forum');
insert into forums(name,description) values('Architects','Architects Forum');
insert into forums(name,description) values('General','General Forum');
insert into topics(forumid,name,description) values(1,'Java Overall','Topic Java Overall');
insert into topics(forumid,name,description) values(1,'JSP','Topic JSP');
insert into topics(forumid,name,description) values(1,'EJB','Topic Enterprise Java Beans');
insert into topics(forumid,name,description) values(1,'Swings','Topic Swings');
insert into topics(forumid,name,description) values(1,'AWT','Topic AWT');
insert into topics(forumid,name,description) values(1,'Web Services','Topic Web Services');
insert into topics(forumid,name,description) values(1,'JMS','Topic JMS');
insert into topics(forumid,name,description) values(1,'XML,HTML','XML/HTML');
insert into topics(forumid,name,description) values(1,'Javascript','Javascript');
insert into topics(forumid,name,description) values(2,'Oracle','Topic Oracle');
insert into topics(forumid,name,description) values(2,'Sql Server','Sql Server');
insert into topics(forumid,name,description) values(2,'MySQL','Topic MySQL');
insert into topics(forumid,name,description) values(3,'CSS','Topic CSS');
insert into topics(forumid,name,description) values(3,'FLASH/DHTLML','Topic FLASH/DHTLML');
insert into topics(forumid,name,description) values(4,'Best Practices','Best Practices');
insert into topics(forumid,name,description) values(4,'Longue','Longue');
insert into topics(forumid,name,description) values(5,'General','General Discussion');
insert into threads(topicid,subject,replies,author,lastpostdate) values (1,'About Java Tutorial',2,'a@b.com','1/27/2008 02:44:29 PM');
insert into threads(topicid,subject,replies,author,lastpostdate) values (1,'Java Basics',0,'x@y.com','1/27/2008 02:48:53 PM');
insert into threads(topicid,subject,replies,author,lastpostdate) values (4,'Swings',0,'p@q.com','1/27/2008 03:12:51 PM');
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spid SMALLINT,
dbid SMALLINT,
ObjId INT,
IndIdSMALLINT,
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ResourceNCHAR(32),
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StatusNVARCHAR(5)
)
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(
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...
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