I have the following table -
---------------
+ RESULTS +
---------------
pk | user | round

1 | 8 | 1
2 | 8 | 2
3 | 8 | 3
4 | 5 | 1
5 | 5 | 2
6 | 5 | 1
7 | 2 | 3

How can I go about selecting all the user id's but only where that user has round 1,2 and 3.
This means from the above example I would only have user - 8 returned. I'm using MySQL.

Many thanks in advance.