Question

I have two columns (both primary) [PLAYER_ID] [LEAUGE_ID]

something like this:

Player_id      League_id
2139            8
2153            8
2302            10
2441            8
2441            10  

I am trying to find the same player who played in both leagues

According to the table above, I am trying to only find:

Player_id     League_id_1     League_id_2
2441          8               10

Thanks in advance!

Answer 1

If you don’t mind having it in rows:

SELECT t.*
FROM myTable t
INNER JOIN
(
    SELECT Player_id
    FROM myTable
    GROUP BY Player_id
    HAVING COUNT(*) = (SELECT COUNT(DISTINCT(League_id)) FROM myTable)
) p ON t.Player_id = p.Player_id

This should return:

Player_id    League_id
2441         8
2441         10

SQL Fiddle