Michael Fuhr wrote:
SELECT DISTINCT ON (aid) aid, cat
FROM tablename
ORDER BY aid, weight DESC, cat;
Good pointer. I think this will solve my problem. :)
SELECT aid, cat
FROM tablename AS t
JOIN (SELECT aid, max(weight) AS weight
FROM tablename
GROUP BY aid) AS s USING (aid, weight);
This query will return duplicates if there are multiple categories (for
one aid) with the same max weight. Yet, I should be able to remove the
duplicates somehow...:)
I really appreciate your help!
--
All best,
Weimao
Weimao Ke
Indiana University Bloomington
School of Library and Information Science
http://ella.slis.indiana.edu/~wke
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