Reid,
> where any one of these 3
>
> 1 1 2011-01-01
> 1 1 2011-01-01
> 1 3 2011-01-01
>
> or any one of these 2
> 3 1 2011-01-05
> 3 2 2011-01-05
>
> are suitable for val = 1, val = 3 respectively.
Can you please describe in words what you are trying to accomplish? When
I look at your data and expected output, I'd say you want this:
For each distinct value of "val1", return any value of "val2" and
the lowest value of "date".
This is actually quite simple - you could also use max(), avg(), ...
instead of min for val2:
SELECT val1, min(val2), min(date)
FROM data
GROUP BY val1
Best regards
-hannes
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