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

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.

Guy Hengel [angelIII / a3]

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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divyeshhdoshi

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

BlakeRogers

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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