How do I use a comma separated list of values as a filter in T-SQL?

Question

I have a basic SQL query, starting with:

SELECT top 20 application_id, [name], location_id FROM apps

Now, I would like to finish it so that it

Answer 1

The following should do the trick for you.

DECLARE @lid SMALLINT

SET @lid = 0

SELECT top 20 application_id, [name], location_id

FROM apps

WHERE ((@lid > 0 AND location_id = @lid)

  OR (@lid = 0 AND location_id > @lid))

If @lid = 0 then it will return ALL rows. IF @lid has a particular value, only the row for that @lid value is returned.