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Complicated "group by" question

From: Andrew Perrin <clists(at)perrin(dot)socsci(dot)unc(dot)edu>
To: pgsql-sql(at)postgresql(dot)org
Subject: Complicated "group by" question
Date: 2004-08-25 17:04:02
Message-ID: Pine.LNX.4.53.0408251300580.20106@perrin.socsci.unc.edu (view raw or flat)
Thread:
Lists: pgsql-sql
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(at)perrin(dot)socsci(dot)unc(dot)edu * andrew_perrin (at) unc.edu


Responses

pgsql-sql by date

Next:From: Josh BerkusDate: 2004-08-25 17:47:18
Subject: Re: Complicated "group by" question
Previous:From: Jan WieckDate: 2004-08-25 14:53:33
Subject: Re: PQexec and SPI_exec

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