Question

This might be an easy one, but I’m not really experienced with sql.

I have a table with two user_id columns, user1 and user2. This table contains some compared values between the two users.

I want to send in an user id, and return all the id’s from the other user when the sent user is either user1 or user2.

I guess some sort of if test would do the trick, but I don’t know how to do this in SQL.

Cheers

Answer 1

You can do:

SELECT user1 FROM TAB WHERE user2=id
UNION ALL
SELECT user2 FROM TAB WHERE user1=id