Question

I have a users table and a friends table.

I want to get the friendships of 1 user, but getting both user info in results.
For example, let’s say I have these tables:

- users (_id_, username, firstname, lastname)
- friends (_#id1, #id2_)

Here are some data:

- users (1, foo, Foo, BAR)
        (2, john, John, DOE)
- friends (1, 2)

If I query fiendship WHERE id1 = 1 OR id2 = 1, I know that with a JOIN I can get for each row, the user data. But how to get in 1 result (1 row) both users data?

Answer 1

SELECT
    u1.*,
    u2.*
FROM
    friends
    JOIN users AS u1
        ON friends._#id1=u1._id_
    JOIN users AS u2
        ON friends.#id2_=u2._id_