Hi,
Could someone confirm that the following query:
update table set x=1, y=1, z=1 where a = 1 or b = 1 or c = 1 or d = 1
is more efficient than this query:
update table set x=1, y=1, z=1 where e <> 1 and f <> 1 and g <> 1
Thanks!
I have the following 2 tables:location:placelftrgt-------------------Europe099England110France1120Italy2130Asia100199London1212staff:namelocLft--------------Edwards0Smith1Leveil11Rossi21Lee12Chan100location uses the Celko hierarchy model.I wish to retrieve for a location the names of all staff within it andthe hierarchy of place associated with that member of staff, eg aquery for Europe should return all staff in Europe, and for Lee I wishto return Lee-London, Lee-England, Lee-Europe etc.I can achieve this using a subquery, ieSELECT name, placeFROM staff, locationWHERE name IN (SELECT nameFROM staff, locationWHERE place='Europe' And locLft>=location.lft AndlocLft<=location.rgt)AND locLft>=lft AND locLft<=rgtBut is this the most efficient way of doing so?Thanks
View 1 Replies View RelatedSuppose I have two tables(Customer and Order) which are as follows:
Code:
Customer
customer_id
first_name
[Code]....
Another thing I am concerned about is that in the line INNER JOIN Order ON Customer.customer_id = Order.customer_id , I have written Customer.customer_id on the left hand side. Is that correct or I should write it on the right hand side of the equal sign?
Hi,
Please have a look at the following two queries, the purpose of which is to find which ten users (represented by 'Username') have created the most records which contain the term 'foo':
SELECT TOP 10 Username, COUNT(*) AS [Count] FROM Options
WHERE FREETEXT(*, 'foo')
GROUP BY Username
ORDER BY [Count] DESC
SELECT TOP 10 Username, COUNT(*) AS [Count] FROM Options
JOIN FREETEXTTABLE (Options, *, 'foo', 500) ct
ON OptionID = ct.[KEY]
GROUP BY Username
ORDER BY [Count] DESC
They both produce the same result set. However, I am wondering which is more performant. At first glance, it would seem the first one would be. It doesn't involve a JOIN and should, therefore, be more efficient.
But this depends on how the FREETEXT expression is evaluated. My concern is that internally, SQL Server would generate an entire recordset based on 'WHERE FREETEXT(*, 'foo')', which could be thousands of records, and only then restrict this to the TOP 10 by COUNT.
If this does happen, then it would be better to join to a FREETEXTTABLE, where I can at least restrict the result set using the 'top_n_by_rank' parameter (which is set as '500' in this case, as this seems a good balance of performance against the likely number of duplicates I will get in my FREETEXTTABLE results).
So... I am worrying about this unnecessarily? Should I just use the simpler first version?
Any thoughts appreciated.
Thanks
When I run the following query from Query Analyzer in SQL Serer 2005, I get a message back that says.
Command(s) completed successfully.
What I really need it to do is to display the results of the query. Does anyone know how to do this?
declare @SniierId as uniqueidentifierset @SniierId = '85555560-AD5D-430C-9B97-FB0AC3C7DA1F'declare @SniierAlias as nvarchar(50)declare @AlwaysShowEditButton as bitdeclare @SniierName as nvarchar (128)/* Check access for Sniier */SELECT TOP 1 @SniierName = Sniiers.SniierName, @SniierAlias = Sniiers.SniierAlias, @AlwaysShowEditButton = Sniiers.AlwaysShowEditButtonFROM SniiersWHERE Sniiers.SniierId=@SniierId
hi,
I have this simple sql query - it should be pretty obvious what I'm trying to achieve but this syntax isn't accepted on SQL 2005, any suggestions?
SELECT Name FROM Users WHERE UsersID IN (EXEC dbo.ReturnDataByModule 'Groups',1200)
Hi I'm new to SQL and I'm stuggling with a simple query in MS-server 2005 and wondered if anyone can help me.
I'm trying to devide the ansewrs of two seperate queries, but both the queries use the same coloumn in the where clause to get the answer. Please can some one help!
eg.
select Sum(column1)
where column1 = 'x'
devided by
select Sum(column1)
where column1 = 'y'
I have a table like this:Name, SSNJoe Smith, 1111Tom Why, 2222Larry Sam, 3333Paul Tom, 4444Steve bob, 1111I want a query to pull offJoe Smith, 1111Steve bob, 1111because someone accidently put in two different names with the sameSSN. There should only be one 1111 in the SSN field in the wholedatabase. I want to pull the duplicate SSN with the name. How can onequery do this. I can write a VB program to do it but I think a queryshould work.I know how to do this:SELECT SSN, COUNT(*) AS cntFROM testGROUP BY fSSNHAVING (COUNT(*) > 1)to find the duplicate SSN but I need the name listed with the SSN also.Any help?? Thanks!!Sheila
View 3 Replies View RelatedFirst, let me apologize for how easy this probably is:DESCR TYPE SELL StartDate EndDate65048 04 Price A 4/21/2004 4/26/200465048 06 Price C 4/20/2004 4/27/200465048 08 Price B 4/22/2004 4/28/200465049 04 Price A 4/19/2004 4/24/200465049 06 Price B 4/22/2004 4/25/200465049 09 Price C 4/20/2004 4/29/200465050 07 Price A 4/21/2004 4/25/200465050 06 Price B 4/18/2004 4/28/200465050 05 Price C 4/17/2004 4/29/2004Descr, Type, Sell are CHARStartDate and EndDate are SmallDatetimeI need a simple query that would display the records with:Highest TYPE for each DESCR with:"Date I Enter" >= Startdate"Date I Enter" <= EnddateResults for ("Date I Enter" = 4/23/2004) should be:65048 08 Price B 4/22/2004 4/28/200465049 09 Price C 4/20/2004 4/29/200465050 07 Price A 4/21/2004 4/25/2004I would give you what I have done but it is such a mess I am better offstarting over.Thanks!!-----= Posted via Newsfeeds.Com, Uncensored Usenet News =-----http://www.newsfeeds.com - The #1 Newsgroup Service in the World!-----== Over 100,000 Newsgroups - 19 Different Servers! =-----
View 3 Replies View RelatedHello everyone,
I hope you mind a questions from an inexperienced SQL 2000 user.
I don't have much experience with building queries for SQL2000. So I am lookinf for a software tool that will help me create simple queries. I'm also looking for an online (either on the web or a downloadable program) query reference to help remine me how to make these queries.
Thank you,
mike
I have two tables (tblRequest and tblDev) whose items have many-to-manyrelationships with each other. I have set things up like this(simplified):Table 1 fields: tblRequest.PrimaryKey tblRequest.Descriptionexample: 10 45 Elm11 63 Green12 123 Main Street13 23 PineTable 2 fields: tblDev.PrimaryKey tblDev.Descriptionexample: 20 Local. No issues21 City owned and main22 Out of county23 Not seen by officerThen Table 3 keeps track of the relationships between tables 1 and 2 bytracking the primary key of the linked items in tables 1 and 2.Table 3 fields: tblLink.RequestPrimaryKey tblLink.DevPrimaryKey10 2010 2111 2212 22Items from tables 1 and 2 may or may not have a relationship listed intable 3.So given an item in tblRequest:tblRequest.PrimaryKey tblRequest.Description12 123 Main StreetI need two queries...The first query would return ALL items from tblDev that are notassociated with this item in tblRequest - in this case 20, 21, 23.The second query would return ALL items from tblDev that ARE associatedwith this item in tblRequest - in this case 22.That's it. Thanks in advance
View 1 Replies View Relatedhi all,I have a table of customers.I have a table of products they have ordered.How can I find all customers who have ordered productA and productB atany time.It sounds so easy, but I can't quite get my head around it!thanksTim
View 7 Replies View RelatedHi,
I have this query:
Code:
SELECT LB.WBS2, LB.WBS3, LedgerAR.WBS2 AS Expr1, LedgerAR.WBS3 AS Expr2, LB.AmtBud AS amtbud, SUM(LedgerAR.Amount * - 1) AS amt
FROM LB LEFT OUTER JOIN
LedgerAR ON LedgerAR.WBS1 = LB.WBS1 AND LedgerAR.WBS2 = LB.WBS2 AND LedgerAR.WBS3 = LB.WBS3
WHERE (LB.WBS1 = '001-298')
GROUP BY LB.WBS2, LB.WBS3, LedgerAR.WBS2, LedgerAR.WBS3, LB.AmtBud
it produces the following output:
Code:
WBS2WBS3Expr1Expr2amtbudamt
014101014101300095
1217010121701080007290
12170804000
121709012170903200065960
121711012171101800034450
121712012171204400038010
12171402000
1217170121717013500935
12171804500
1217220500
12172601000
12175001217500800622.5
12221604000
I want to sum the amtbud column like I did for the amt column. and group everything based on WBS2. However, I keep getting an outrageous amount for the amtbud. This is what is seems to be summing up:
Code:
01410101410130000
014101014101300047.5
12170901217090320000
12170901217090320000
12170901217090320000
12170901217090320000
12170901217090320000
12170901217090320000
12170901217090320000
12170901217090320000
12170901217090320000
etc....
Any help will be appreciated I am just stumped.
I am curretnly a newbie at SQL Server..but i am really good with Access.....i am looking into converting to SQL Express but i have this one issue. Below is a snippet of SQL from my VB6 app. SQL Server 2005 says i cant use 'Cdbl'
T, W, L_value.....are strings in the varchar in my SQL DB. OS_T, L, W dont exist on my actual DB i make the RS disconnected and play with the data. This snippet works fine in Access, but as expected it doesnt in SQLS...Wha are my options, if any? Thanks in advance for any help or advice.
strSQL = strSQL & "ORDER.OS_T_value, "
strSQL = strSQL & "Cdbl(0.0) as OS_T_Sort, "
strSQL = strSQL & "ORDER.OS_W_value, "
strSQL = strSQL & "Cdbl(0.0) as OS_W_Sort, "
strSQL = strSQL & "ORDER.OS_L_value, "
strSQL = strSQL & "Cdbl(0.0) as OS_L_Sort, "
I am curretnly a newbie at SQL Server..but i am really good with Access.....i am looking into converting to SQL Express but i have this one issue. Below is a snippet of SQL from my VB6 app. SQL Server 2005 says i cant use 'Cdbl'
T, W, L_value.....are strings in the varchar in my SQL DB. OS_T, L, W dont exist on my actual DB i make the RS disconnected and play with the data. This snippet works fine in Access, but as expected it doesnt in SQLS...Wha are my options, if any? Thanks in advance for any help or advice.
strSQL = strSQL & "ORDER.OS_T_value, "
strSQL = strSQL & "Cdbl(0.0) as OS_T_Sort, "
strSQL = strSQL & "ORDER.OS_W_value, "
strSQL = strSQL & "Cdbl(0.0) as OS_W_Sort, "
strSQL = strSQL & "ORDER.OS_L_value, "
strSQL = strSQL & "Cdbl(0.0) as OS_L_Sort, "
How do I rewrite this query so that I do not use a temp table?
SELECT SITEID, MIN(R1PROGRAM) AS MINR1, MAX(R1PROGRAM) AS MAXR1
INTO #TEMP1
FROM SITECONTROLDATA
WHERE CALC_DATE > GETDATE() - 12
GROUP BY SITEID
SELECT * FROM #TEMP1 WHERE MINR1 = MAXR1
SQL Server 2000. Here's what I have so far. The section of the query I need help with is highlighted in blue.
CREATE PROCEDURE dbo.GetByVersion
(
@targetVersion varchar(30),
@product varchar(50)
)
AS
SET NOCOUNT ON;
SELECT * FROM MyTable
WHERE (product = @product)
AND
CASE
WHEN @targetVersion='' THEN (targetVersion='')
ELSE (targetVersion LIKE @targetVersion + '%')
END
GO
I get a syntax error in the Stored Procedure editor on an equal sign in this line:
WHEN @targetVersion='' THEN (targetVersion='')
What I want is this (in psuedocode):
if @targerVersion is blank
search for records where the targetVersion column = blank
else
search for records where the targetVersion column starts with @targetVersion
Can anyone offer any suggestions as to how I might modify my query to do what I want? Any help is very much welcome - Thanks in advance! :-)
I am looking for a simple example or guidance on how to move the results of a query from a mysql database to sql server 2005 using SSIS.
It seems rather difficult to do this or at least I am stuggling to figure it out. It was easy to do in DTS, how do you do it in SSIS?
Hi,
we've created a ata Flow task to execute several aggregations. Our Task access database using OLE DB source and selects data out of our staging tables (we've analyzed the query using MS SQL Management Studio which didn't showed any issues). But when we try to run our dataflow task using SSIS (debug mode and DTEXEC from command line) we experince that tasks seem to stop during processing.
Unfortunately we didn't found a way to see long logfile entries which explain the issue to us.
We do use several aggregation tasks divided in 4 sequences. Unfortunately we just see one logical processor out of 4 logical processors working. It is a Windows 2003 SP2 machine with SQL 2005 SP2 on top of it.
Is there any solution to use all processors to one package for parallel execution?
So basically we experience two issues:
- SSIS seems to stop somewhere in thre middle
- SSIS just uses one processor instaed of all four
your advice is appreciated
I want to select one field from a table,but it should on some conditionswhich refer to 5 table ,such as A.FILED1=B.FIELD1 AND B.FIELD2=C.FIELD3 AND....Should I use case "select sum(a.amount) from a,b,c,... wherea.field1=b.field1 and b.field2=c.field2 and ..." or "select sum(a.amount)from select b.field1 from select c.field2 from...."?And which case is moreefficiency?thanks!我想计算一个表中的某个字段的和，但此记录需在从多个 表中查询此记录是否满足特定的条件。那么我是用select ..from ...where ..and ..and..and ..and ..还是用select ..fromselect ..from select ..from ......？请问是哪一个效率高？谢谢！
View 2 Replies View RelatedHello,I am looking at optimizing site searching on a web application. I have two thoughts on the idea:1. create views with fulltext indexes combining records from multiple tables.2. create a table with an xml column and primary index. I understand the xml column type has the overhead of a BLOB under the hood, but that a primary xml index can "shred" the contents and improve parsing. I also read the xml column is actually searched as a tree, providing some variant of log(n) run time. Does anyone know of good literate on this subject, the more big O notation, runtime analysis types of posts the better.Thanks
View 5 Replies View RelatedHi guys,
Since the project that i'm developing is rapidly increasing, the pages seems to be getting slower everytime you view it. I would like to ask if code below would be efficient enough for several simultaneous request of data or if you have any other suggestions, you are welcome to add:
1 Public Shared Function QueryDatabase(ByVal sql As String) As DataTable2 3 ' SQL Server Connection Object Variable4 Dim _oConnection As SqlConnection5 ' SQL Server Command Object Variable6 Dim _oCommand As SqlCommand7 ' SQL Server Data Adapter Object Variable8 Dim _oAdapter As SqlDataAdapter9 ' DataTable Object Variable (Early Binding)10 Dim _oDataTable As New DataTable11 12 ' Instantiate Connection Object with connection string13 _oConnection = New SqlConnection("Data Source=XXX.XXX.XXX.XXX;Initial Catalog=XXXXXX;User=XXX;Pwd=XXX;")14 ' Instantiate Command Object with SQL String and Connection Object15 _oCommand = New SqlCommand(sql, _oConnection)16 ' Instantiate Data Adapter Object with Command Object17 _oAdapter = New SqlDataAdapter(_oCommand)18 ' Fill the DataTable Object with the retrieve records19 _oAdapter.Fill(_oDataTable)20 21 ' Release resources used by DataAdapter Object22 _oAdapter.Dispose()23 24 ' Release resources used by Command Object25 _oCommand.Dispose()26 27 ' Close the connection of the Connection Object from SQL Server28 _oConnection.Close()29 30 ' Release resources used by Connection Object31 _oConnection.Dispose()32 33 ' Return the retrieve records34 Return _oDataTable35 36 End Function Thanks a lot.
Hey,I am developing a website which will be used by a large number of people so I am concerned about efficiency.Sorry for the three posts but anyone with any info would be appreciated.The database has the following tables: FACILITY-----MEETING ---- | | USERS---- -------- MEETING_INVITE -------- REMINDER | | ---------CONTACTS-------When the user logs in I use there username to access the rest of the tables. I get all of the users information out of the database in one go and store it in a dataset.So when a user accesses there meetings page, I pass the dataset to that page with a server transfer.Question 1 > Is it more efficient to open the database once and access all the information and pass the information to seperate tables or is it more efficient to access the database on the individual pages and thus not passing of information.---------------------------------------------------------------------------------------------------------------In order to access the information I use 6 Select statements in a rowHere is an example of my select statments: SELECT * FROM USERS WHERE email = textbox_emailSELECT FACILITY.* FROM FACILITY, USERS WHERE FACILITY.email = USERS.email AND USERS.email = textbox_emailBy the time I get to the REMINDER table I am combining all the tables and my query is eight lines long.Question 2 > Is there a way of combining the results of a previous select to access information?---------------------------------------------------------------------------------------------------------------Question 3 > What do you think of my table design? The lines represent one to many relationships. If you can give me any tips on databases please do.Thanks for your time,Padraic
View 2 Replies View RelatedHello all,I am developing a website which may be used by a large number of people in the future and I am concerned about performance.
Is it better to have one table with 50, 000 rows or 5,000 tables with 10 rows each?
Is there a way to divide a table in two if the table reaches a certain size?
Is there a limit on the size of tables?
Is there a limit on the number of tables?
Is it possible to create tables from vb.net?
Is it possible to program checks into sql server? For example, could I delete data that has passed a certain date or send an automated email when a time is reached?
Thanks for your time,Padraic
Hey people
I'd be really grateful if someone can help me with this. Could someone explain the following:
If the following code is executed, it runs instantly:
declare @SellItemID numeric (8,0)
select @SellItemID = 5296979
SELECT distinct s.sell_itm_id
FROM stor_sell_itm s
WHERE (s.sell_itm_id = @SellItemID )
However, if I use this WHERE clause instead -
WHERE (@SellItemID = 0 OR s.sell_itm_id = @SellItemID)
- it takes 70 micro seconds. When I join a few more tables into the statement, the difference is 4 seconds!
This is an example of a technique I'm using in loads of places - I only want the statement to return all records if the filter is zero, otherwise the matching record only. I think that by using checking the value of the variable in the WHERE clause, a table scan is used instead of an index. This seems nonsensical since the variable is effectively a constant. Wrapping the entire select statement with an IF or CASE works, but when I've got 10 filters I'd have to 100 select statements.
I DON'T GET IT!! There must be a simple answer, HELP!!
Jo
PS this problem seems to occur both in 6.5 and 7.0
Hi All,
I tried my luck in the Access forum and I've search the web and MSDN for an answer with little luck.
Simply, is it better to update a table via an UPDATE query or Recordset manipulation?
I have read that if you were to update 10,000 records an UPDATE query is more efficient (obviously), but does that transend down to say 1 - 10 updates?
i.e. There are six unique updates I want to make to 6 different rows. Should I code the backend VB to execute 6 different queries or seek and update a recordset?
It's a MS Access XP app with ADO 2.8.
My gut feeling on this is that making 6 update queries is more efficient, both with system resources and record-locking issues; I'd just like another opinion on the matter.
I appreciate your help!
Thanks,
Warren
I am using nested cursors in my script below, and wonder if there is a more efficient way please?
USE ar
GO
DECLARE @mortgage INT,
@mortgage_sequence int,
@getMortgage CURSOR,
@notes_1 varchar(MAX),
@notes_2 varchar(MAX),
@notes_3 varchar(MAX),
@notes_4 varchar(MAX),
@notes_5 varchar(MAX),
@notes_6 varchar(MAX),
@notes_7 varchar(MAX),
@notes_8 varchar(MAX),
@notes_9 varchar(MAX),
@notes_10 varchar(MAX),
@notes_11 varchar(MAX),
@notes_12 varchar(MAX),
@notesComplete varchar(MAX),
@addedUser varchar(255),
@addedDate varchar(255),
@amendedUser varchar(255),
@amendedDate varchar(255),
@sequence int,
@getDetail CURSOR
SET @getMortgage = CURSOR FOR
SELECT DISTINCT Mortgage_Number, Mortgage_Note_Sequence_No
FROM format_additional_notes
GROUP BY Mortgage_Number, Mortgage_Note_Sequence_No
ORDER BY Mortgage_Number ASC
OPEN @getMortgage
FETCH NEXT
FROM @getMortgage INTO @mortgage, @mortgage_sequence
WHILE @@FETCH_STATUS = 0
BEGIN
SET @getDetail = CURSOR FOR
SELECT ltrim(rtrim(Additional_Text_1)),
ltrim(rtrim(Additional_Text_2)),
ltrim(rtrim(Additional_Text_3)),
ltrim(rtrim(Additional_Text_4)),
ltrim(rtrim(Additional_Text_5)),
ltrim(rtrim(Additional_Text_6)),
ltrim(rtrim(Additional_Text_7)),
ltrim(rtrim(Additional_Text_8)),
ltrim(rtrim(Additional_Text_9)),
ltrim(rtrim(Additional_Text_10)),
ltrim(rtrim(Additional_Text_11)),
ltrim(rtrim(Additional_Text_12)),
Mortgage_Note_Sequence_No,
Extra_Added_by_User,
Extra_Added_on_Date,
Extra_Amended_By_User,
Extra_Amended_By_Date
FROM format_additional_notes
WHERE Mortgage_Number = @mortgage AND Mortgage_Note_Sequence_No = @mortgage_sequence
ORDER BY Mortgage_Note_Sequence_No
OPEN @getDetail
SET @notesComplete = ''
FETCH NEXT FROM @getDetail INTO @notes_1,
@notes_2,
@notes_3,
@notes_4,
@notes_5,
@notes_6,
@notes_7,
@notes_8,
@notes_9,
@notes_10,
@notes_11,
@notes_12,
@sequence,
@addedUser,
@addedDate,
@amendedUser,
@AmendedDate
WHILE (@@FETCH_STATUS = 0)
BEGIN
SET @notesComplete = @notesComplete +
ISNULL(@notes_1,'') + ' ' +
ISNULL(@notes_2,'') + ' ' +
ISNULL(@notes_3,'') + ' ' +
ISNULL(@notes_4,'') + ' ' +
ISNULL(@notes_5,'') + ' ' +
ISNULL(@notes_6,'') + ' ' +
ISNULL(@notes_7,'') + ' ' +
ISNULL(@notes_8,'') + ' ' +
ISNULL(@notes_9,'') + ' ' +
ISNULL(@notes_10,'') + ' ' +
ISNULL(@notes_11,'') + ' ' +
ISNULL(@notes_12,'')
FETCH NEXT FROM @getDetail INTO @notes_1,
@notes_2,
@notes_3,
@notes_4,
@notes_5,
@notes_6,
@notes_7,
@notes_8,
@notes_9,
@notes_10,
@notes_11,
@notes_12,
@sequence,
@addedUser,
@addedDate,
@amendedUser,
@AmendedDate
END
INSERT INTO format_additional_notes_1
(Mortgage_Number,
Mortgage_Note_Sequence_No,
Additional_Text,
Extra_Added_By_User,
Extra_Added_on_Date,
Extra_Amended_By_User,
Extra_Amended_By_Date)
VALUES
( @mortgage,
@sequence,
@notesComplete,
@addedUser,
@addedDate,
@amendedUser,
@amendedDate)
CLOSE @getDetail
DEALLOCATE @getDetail
FETCH NEXT
FROM @getMortgage INTO @mortgage, @mortgage_sequence
END
CLOSE @getMortgage
DEALLOCATE @getMortgage
GO
I would like to use MVJ's formula for creating a date table.
I would like to use it with our main ERP database. However, I am reluctant to make changes to it because I fear that at some point when we upgrade that software and it's database that the upgrade program will delete my table.
So, here is my question. Performance wise, does it matter whether I add the date table to our ERP database or if I create another database (on the same server) for the custom date table? Does linking between databases take substantially longer than linking within the same database?
Hi,
okay so I'm refactoring some code at the moment. At the moment, I'm working on a search screen. This search screen lets the user enter a number of criterias, I'm working on drags data from a view and then programmatically filters it according to the search filters.
This is obviously inefficent and non-scalable as the view drags out every entry and returns to the data layer, which then filters it.
I'm wondering what the best way to refactor this? i'm thinking the best way is to tell the db what to filter on, so it'll only drag out the right amount of data.
Therefore, should I keep the view? Is there any way of entering parameters into views or am i going to need to change this into a stored proc?
hi,Allcould you tell me which case is more efficiency?(my tables have no index)And does it has any else case more efficiency?case1:"select sum(Invoice_Production.Quantity) from Invoice_Production,(select[dat_Item].ItemCode from [dat_Item],(select [dat_MachineType].MachineTypeIDfrom [dat_MachineType]"&subQuery&") as T3 where [dat_Item].MachineTypeID =T3.machinetypeid) as T1,(select [Invoice].InvoiceNo from Invoice,(select[users].user_id from [users] where [Users].User_ID = '"& rs2(0) &"') as T4where T4.User_ID = invoice.dealerno and Invoice.Cyear >= "&startYear&" andInvoice.Cyear <= "&endYear&" and Invoice.Cmonth >= "&startMonth&" andInvoice.Cmonth <= "&endMonth&") as T2 where invoice_production.ItemCode =T1.ItemCode and T2.invoiceno = invoice_production.invoiceno"case2:"select sum(Invoice_Production.Quantity) from[Invoice_Production],[Invoice],[dat_MachineType],[dat_Item],[users] where[users].user_id = [invoice].DealerNo and [dat_Item].ItemCode =[Invoice_Production].ItemCode and [dat_Item].MachineTypeID =[dat_MachineType].MachineTypeID and [Invoice_Production].InvoiceNo =[Invoice].InvoiceNo and [Users].User_ID = '"& rs2(0) &"' and Invoice.Cyear
Quote:
How efficient is ti to use join views in a database?I'm developing an e-commerce system and using join views to join theproduct, product category and product review tables and wondering if thiswould have any adverse effect on performance.Thanks in advance
View 3 Replies View Related
Greetings all,
I need to determine a hierarchy from a table with EmpID's and SupID's. Basically, the President doesn't have a SupID so it will be null. I need to determine programatically the hierarchy to keep it simple.
I have code that works and I was hoping for advice on optimizing it 'cuz it uses a cursor.
Also, It only deals with less than 300 records.
Code Block
CREATE TABLE Employee(fName varchar(30), EmpID int, SupID int)
INSERT INTO Employee SELECT 'Adam', 1, 4
INSERT INTO Employee SELECT 'Joe', 2, 4
INSERT INTO Employee SELECT 'John', 3, 4
INSERT INTO Employee SELECT 'Frank', 4, 10
INSERT INTO Employee SELECT 'Jane', 5, 10
INSERT INTO Employee SELECT 'Kristy', 6, 10
INSERT INTO Employee SELECT 'Angie', 10, 11
INSERT INTO Employee SELECT 'Ron', 11, NULL
--=====================================================================================
-- CODE
--=====================================================================================
CREATE TABLE #temp(Hierarchy int, myName varchar(30), SupID int, EmpID int)
INSERT INTO #temp SELECT 1, fName, SupID, EmpID FROM Employee WHERE SupID IS NULL
--NULL SupID means that they are at the top most branch
DECLARE @Counter int --Counter is used to increment
SET @Counter = 1
DECLARE MY_CURSOR Cursor
FOR
SELECT SupID, EmpID, fName
FROM Employee
ORDER BY SupID --ORDER BY SupID to bring NULLs to top
Open My_Cursor
DECLARE @EmpID int, @SupID int, @Name varchar(30)
FETCH NEXT FROM MY_Cursor INTO @EmpID, @SupID, @Name
WHILE (@@FETCH_STATUS = 0)
BEGIN
SET @Counter = (SELECT MAX(Hierarchy) FROM #temp) + 1 --Get the highest hierarchy ID and increment by 1
INSERT INTO #temp
SELECT @Counter, fName, SupID, EmpID
FROM Employee
WHERE SupID IN (SELECT EmpID FROM #temp WHERE EmpID = @SupID)
FETCH NEXT FROM MY_CURSOR INTO @EmpID, @SupID, @Name
END
CLOSE MY_CURSOR
DEALLOCATE MY_CURSOR
SELECT * FROM #temp
DROP TABLE #temp
Thanks in advance,
Adam
Howdy folks!
I've got a database that needs to run 24/7. I'm looking into maintanence options and wanted to run the following by y'all:
Ok, I've read the MSDN "Maintaining databases" article and noticed the following statement about autoshrinking: "This technique uses almost no processor time and memory". I also searched these forums and found that many users say autoshrinking heavily lags down sql transfers. So who's right? And if it does lag transfers, by how much?
Another question I have about autoshrink is fragmentation. It would seem to me that over time solely depending on autoshrink would cripple a server in terms of fragmentation; is this the case?
Also, does autoshrink (or manual shrinking or compacting) update the statistics?
Final question!!! I'm programming in native c++, is there a way for me to run commands such as "DBCC SHRINKDATABASE" in native OLE DB code?
Thanks!