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How can I construct a sql statement using variables to change the where clause with several parameters

Posted on 2011-03-18
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Last Modified: 2012-05-11
I am trying to build a sql statement using a variable.

SELECT * FROM Mytable
WHERE
@MyVariaable = (                  
CASE @MyVariaable                              
WHEN 'A' THEN
ColumnA > Null OR ColumnAB > 0 OR ColumnAC > 0
WHEN 'E' THEN
ColumnE > Null OR ColumnEB > 0 OR ColumnEC > 0
END

CASE is very good at returning 1 column or variable, but not multiples.
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Question by:Internet_Engineer
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Expert Comment

by:Guy Hengel [angelIII / a3]
Comment Utility
you have to do a OR:
SELECT * FROM Mytable
WHERE ( ( @MyVariable = 'A' AND ColumnA > Null OR ColumnAB > 0 OR ColumnAC > 0 )
      OR( @MyVariable = 'E' AND ColumnE > Null OR ColumnEB > 0 OR ColumnEC > 0 )
      )

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Expert Comment

by:divyeshhdoshi
Comment Utility
DECLARE @SQL1 varchar(200)
DECLARE @WHERE varchar(500)
SET @SQL1='SELECT * FROM btLocations WHERE'

SET @WHERE=' WHERE 1=1 '

SET @Where = @Where + ' AND <Column1>=<Value1>'
SET @Where = @Where + ' AND <Column2>=<Value2>'
SET @Where = @Where + ' AND <Column3>=<Value3>'
SET @Where = @Where + ' AND <Column4>=<Value4>'

EXEC (@SQL1 + @Where );  

or you can use procedure like this


CREATE PROCEDURE [dbo].<procname>  
 @StartRowIndex int,  
 @MaximumRows int,  
 @SortCondition nvarchar(250),  
 @WhereCondition nvarchar(250)  
AS  
BEGIN  
 
 SET NOCOUNT ON  
 
 Declare @SQL1 Varchar(MAX);  
 Declare @SQL2 Varchar(MAX);  
 Declare @SQL3 Varchar(MAX);  
 Declare @SQL4 Varchar(MAX);  
 
 Set @SQL1='WITH TempTable AS (  
  SELECT ROW_NUMBER() OVER (Order By ';  
 Set @SQL2=' ) AS Row,  
      *  
  FROM [btLocations]  
  Where ';  
 Set @SQL3=' )';  
 
 Set @SQL4='SELECT  
 *  
 FROM TempTable  
 WHERE Row between '+Cast(@StartRowIndex As Varchar(3))+' AND '+Cast(@StartRowIndex+@MaximumRows As Varchar(3))+';';  
   
 
 Exec (@SQL1 + @SortCondition + @SQL2 + @WhereCondition + @SQL3 + @SQL4);  
 
 SET ROWCOUNT 0  
END  
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Expert Comment

by:BlakeRogers
Comment Utility
You can use the case statement but you have to be clear about what you want. Greater than null isn't really a good thing. Null means nothing, it doesn't mean zero. So you want to make sure it's is not null but using
IS NOT NULL

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You also didn't end the parenthesis at the end of your where statement.

Also,

You forgot a THEN statement in your case statement. Here is an example.

CASE WHEN DATEDIFF(DAY, DateReported, @endDate) < 1 THEN DATEDIFF(DAY, DateReported, @endDate) ELSE NULL END AS [LessThanDay]

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I've never actually used a CASE in WHERE statement. Hope this helps.
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Accepted Solution

by:
Internet_Engineer earned 0 total points
Comment Utility
Here is the solution:

(@SEX = 'male' AND (TVSHOWS=@TVSHOWS AND RACING=@RACING AND NASCAR=@NASCAR))

(@SEX = 'female' AND (TVSHOWS=@TVSHOWS AND RACING=@RACING AND NASCAR=@NASCAR))
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Author Closing Comment

by:Internet_Engineer
Comment Utility
I was able to find solution outside the site
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