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 are asking different questions here. This is the answer to your original question (about the ternary operator, but as you can see, you don't need anything like a ternary operator for this):

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

But that was before we knew that @lid was a varchar and could contain different comma separated values.

Well, this (about the csv) is another question which has been asked here before:

Passing an "in" list via stored procedure
T-SQL stored procedure that accepts multiple Id values