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Message Posted: Wed, 14 Apr 2004 @ 11:42:07 GMT

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If I understand correctly your request:

I will assume that your target col cannot be included in the "group by" clause so I would see it in two steps:

SELECT A.date_col, A.definition_col, A.target_col FROM mytable A
WHERE (A.date_col, A.definition_col) in
        (
                SELECT MAX(B.date_col), B.definition_col FROM mytable B
                WHERE B.definition_col in (42, 44, 55)
                GROUP BY B.definition_col
        )
;

Don't know if it is the most efficient query but it should return one record per definition (if your PK is a combination of the definition and date cols) with the max date.

A.

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