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8.1

Any way to improve the performance of SQL query with optional parameters ?

Asked by robberbaron in SQL Query Syntax, MS SQL Server

Tags: TSQL


This query returns correct data, just appears to be a bit slower than hoped (about 0.9s in testing on development box)
I will be calling it up to 150 times in succession from my app, using different DocId's
The idea is to determine docrevision with highest priority, including testing a requested docrevision to see what it's priority would be.

ProjectId is alway available. usually only one of DocId and DocNo will be supplied.
I need the RevStyles as a LIKE operation, but am looking at removing the option for LIKE testing of DocId

Query is in a stored proc. Currently SQLS2000. 2005 is available.
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declare @ProjectId varchar(8)
   declare @DocNo int
   declare @DocId varchar(50)
   declare @TestRev varchar(5)
   
   set @ProjectId = '07074'
   set @DocId = 'Q1251-ME-BWSE-1000'
   set @TestRev = 'D'
   
   SELECT  rtrim(Proj_DocRev.RevisionId) AS RevId, Proj_RevStyles.Priority as Priority
   FROM dbo.Proj_Documents  , dbo.Proj_DocRev , dbo.Proj_Codes , dbo.Proj_RevStyles 
 
   WHERE proj_documents.Projectno =  @ProjectId 
        AND ((@DocNo IS NULL) OR (Proj_Documents.DocNo = @DocNo))
        AND ((@DocId IS NULL) OR (Proj_Documents.DocId LIKE @DocId))
        AND Proj_Documents.DocNo = Proj_DocRev.DocNo
        AND Proj_Documents.ProjectNo = Proj_Codes.ProjectNo 
        AND Proj_Codes.RevisionStyle = Proj_Revstyles.Id
        AND Proj_DocRev.RevisionId LIKE Proj_RevStyles.Tag
	UNION 
		 SELECT rtrim(@TestRev) as RevId, Proj_RevStyles.Priority as Priority
		   FROM dbo.Proj_Documents  , dbo.Proj_DocRev , dbo.Proj_Codes , dbo.Proj_RevStyles 
		   WHERE Proj_Codes.ProjectNo =  @ProjectId
				AND Proj_Codes.RevisionStyle = Proj_Revstyles.Id
				AND ((@TestRev IS NOT NULL) AND (@TestRev LIKE Proj_Revstyles.Tag))
		
   ORDER BY Priority DESC,RevId DESC;
[+][-]07/10/09 02:59 AM, ID: 24821668Accepted Solution

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About this solution

Zones: SQL Query Syntax, MS SQL Server
Tags: TSQL
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Solution Provided By: emoreau
Participating Experts: 3
Solution Grade: B
 
[+][-]07/10/09 01:06 AM, ID: 24821171Author Comment

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[+][-]07/10/09 01:19 AM, ID: 24821247Assisted Solution

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[+][-]07/12/09 05:36 PM, ID: 24836581Assisted Solution

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