Question

I have a Where Clause that checks the existence of rows in a subquery, but I only want to execute that check if a bit is set to 1. So for example:

Select * from Listing l
Where
l.IsDeleted=1 
AND CASE WHEN @MustHasPicture = 1  THEN 
(
    EXISTS
    (
        SELECT NULL AS [EMPTY]
        FROM [dbo].[ListingPictures] AS [lp]
        INNER JOIN Listing l ON lp.ListingID=l.ID
    )
)
ELSE 1 END = 1

This syntax is wrong, and I’m hoping someone can point me in the right direction. Thanks.

Answer 1

SELECT * 
  FROM Listing l
 WHERE IsDeleted = 1 
   AND ( @MustHasPicture <> 1 OR 
         (@MustHasPicture = 1 AND l.id IN (
              SELECT listingid
              FROM ListingPictures
            )
         )
       )