where if @param1 <>0 left(value1,4)=@param1
where LEFT(ISNULL(value1, 0000), 4) = CASE WHEN @param1 <> 0 THEN CAST(@param1 AS NVARCHAR(12)) END
@param1
WHERE (@param1 == 0) OR (LEFT(ISNULL(value1, 0000), 4) =@param1)
WHERE ((@PARAM1<>0 AND left(value1,4)=@param1) OR @PARAM1= 0)
var
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