trouble with select and possible group by

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trouble with select and possible group by

Author

Topic

kaisdd
Starting Member

17 Posts

Posted - 2007-08-31 : 10:29:38

hey there, i´m looking for a little help with a query.

i got the following table structure and data:
CommentID, CommentPhotoID, CommentDate, CommentText
1, 1, 2007-05-25, 'Comment A'
2, 2, 2007-05-26, 'Comment B'
3, 1, 2007-05-27, 'Comment C'
4, 1, 2007-05-28, 'Comment D'

what i like to get is a list of new comments ordered by CommentDate desc but having each photo only once. in the end, the list should look like:

4, 1, 2007-05-28, 'Comment D'
2, 2, 2007-05-26, 'Comment B'

tips? anyone?
thank you very much!

SwePeso
Patron Saint of Lost Yaks

30421 Posts

Posted - 2007-08-31 : 10:32:14

SELECT t1.CommentID, t1.CommentPhotoID, t1.CommentDate, t1.CommentText
FROM Table1 AS t1
INNER JOIN (
SELECT CommentPhotoID, MAX(CommentDate) AS maxDate FROM Table1 GROUP BY CommentPhotoID
) AS d ON d.CommentPhotoID = t1.CommentPhotoID AND d.maxDate = t1.CommentDate
ORDER BY t1.CommentPhotoID

E 12°55'05.25"
N 56°04'39.16"

kaisdd
Starting Member

17 Posts

Posted - 2007-08-31 : 11:14:16

wow! that was fast and it works fantastic. thank you very much! kai

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