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

Assuming @locid & @lid are the same, I'm going to use @locid... The following would work. I've split it up to keep it looking good on SO.

SELECT application_id, [name], location_id 
FROM apps
WHERE
  ( 
    @locid = 0
    OR 
    CHARINDEX
    ( 
      ',' + CAST(location_id AS VARCHAR(50)) + ','
      , 
      ',' + @locid + ','
      , 
      0 
    ) > 0
  )