Question

I have 2 tables, users and players

In table users, I have columns userid and username.
In table players, I have columns id, player1, and player2. Column id is an auto increment primary key. Both, player1 and player2 are foreign keys of userid in table users

I’m try to perform a join where I have both player1 and player2 usernames in the same row. For example, userid 4 has a username Sam and userid 6 has a username Kevin. This would be an example of the query result for just one row:

player1  username  player2  username
------------------------------------
   4        Sam       6       Kevin

Answer 1

You can join a single table multiple times as long as you have unique aliases each time:

select p1.userid, p1.username, p2.userid, p2.username
from players p
join users p1 on p.player1 = p1.userid
join users p2 on p.player2 = p2.userid
where ...