I realise I knew the answer to this one, but if I modify it slighly it gives me a headache again, like thus:
Table:
col1 | col2 | col3
--------------------
A | 10 | Z
B | 13 | X
B | 14 | X
C | 11 | Y
Now, if I use
SELECT DISTINCT col1, MAX(col2), col3 FROM Table GROUP...