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

You don't really need the ternary operator for this:

SELECT top 20 application_id, [name], location_id
FROM apps
WHERE (@lid > 0 AND location_id IN (@lid)) OR @lid <= 0