CASE in sql +dynamic query

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SQL-Server-2005

SQL

BEGIN
DECLARE @QRY NVARCHAR(300)
DECLARE @ORDER INT
SET @QRY='SELECT * FROM [dbo].[LIBMAST] WHERE (1=1) '
SET @QRY=@QRY+'CASE'+@ORDER+' WHEN'+1+'THEN ''ORDER BY ACCNO'' ELSE ''ORDER BY CALLNO''END'
END

error showing

SQL

Conversion failed when converting the nvarchar value 'SELECT * FROM [dbo].[LIBMAST] WHERE (1=1) CASE' to data type int."

Posted 21-Feb-13 21:16pm

josh-jw

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gvprabu · Accepted Answer · 2013-02-21T21:33:00

Hi,

Try This... Your Dynamic Query is Wrongly Framed.

SQL

BEGIN
    DECLARE @QRY NVARCHAR(500)
    DECLARE @ORDER INT=2
    SELECT @QRY='SELECT * FROM [dbo].[LIBMAST] WHERE (1=1) ' + CASE WHEN @ORDER=1 THEN 'ORDER BY ACCNO ' ELSE 'ORDER BY CALLNO' END
    PRINT @QRY
END

Regards,
GVPrabu.

willington.d · Accepted Answer · 2013-02-21T21:46:00

Hi Josh

You have to cast the INT to NVARCHAR. I have modified your query like belw:

SQL

DECLARE @QRY VARCHAR(300)
DECLARE @ORDER INT
SET @QRY = N'SELECT * FROM [dbo].[datalog_574T] WHERE (1=1)'
SET @QRY = @QRY + 'CASE'+ CAST(@ORDER AS NVARCHAR(10)) +' WHEN' + CAST(1 AS NVARCHAR(1))+ 'THEN ''ORDER BY ACCNO'' ELSE ''ORDER BY CALLNO''END'

Regards
Willington

CASE in sql +dynamic query

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