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I am trying to write a query that selects recent submissions (sorted
by submission_date) but only selects the most recent one for each
user_id. example query: select distinct on (user_id) * from stories order by date_submitted desc limit 10; However postgres will not allow me to filter out duplicate rows with distinct unless I sort on that column, which would product useless results for me. Group by seems to have similiar problems, plus the additional problem of wanting aggregate functions to be used. I even tried sorting in a subquery, but it still comes out sorted by user_id: select distinct on (user_id) * from stories where sid in (select sid from stories order by date_submitted desc limit 10); How can I work around this limitation to get the results sorted the way I want, then have the duplicates removed? I can't be the only one running into this limitation, there must be some workaround. |
