Andrew,
If assing is not a many to many relation,
why did you not fold accept_id into assign?
Any way, here is the query you need:
select assign.reviewer_id, ss.max_assign_date, accept.assign_id, accept.accept_id
from ( select reviewer_id, max( assign_date) as max_assign_date from assign group by reviewer_id) as ss, assign,
accept
where ss.reviewer_id = assign.reviewer_id and ss.max_assign_date = assign.assign_date and assign.assign_id =
accept.assign_id;
Andrew Perrin wrote:
> I have a table of people ("reviewers"), a table of review assignments
> ("assign"), and a table of review acceptances ("accept"). I would like to
> be able to write a query to return the latest (e.g., max(assign_date))
> assignment for each reviewer, plus the acc_id field from "accept". I
> think I should be able to do this with a GROUP BY clause, but am having no
> luck.
>
> Table structure:
>
> reviewers assign accept
> -----------------------------------------
> reviewer_id assign_id accept_id
> reviewer_id assign_id
> ... assign_date
> ... ...
>
>
> Thanks for any guidance.
>
> Andy
>
> ----------------------------------------------------------------------
> Andrew J Perrin - http://www.unc.edu/~aperrin
> Assistant Professor of Sociology, U of North Carolina, Chapel Hill
> clists@perrin.socsci.unc.edu * andrew_perrin (at) unc.edu
>
>
> ---------------------------(end of broadcast)---------------------------
> TIP 1: subscribe and unsubscribe commands go to majordomo@postgresql.org
>
