From: | Richard Huxton <dev(at)archonet(dot)com> |
---|---|
To: | Gary Stainburn <gary(dot)stainburn(at)ringways(dot)co(dot)uk>, pgsql-sql(at)postgresql(dot)org |
Subject: | Re: master-detail relationship and count |
Date: | 2002-11-29 10:35:12 |
Message-ID: | 200211291035.12923.dev@archonet.com |
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Lists: | pgsql-sql |
On Friday 29 Nov 2002 10:06 am, Gary Stainburn wrote:
> Hi folks.
>
> I've got a master detail relationship where I have a railway route table
> listing landmarks along the route, and a Links table listing URL's
> associated with that landmark. Listed below:
>
> How can I do a query showing the landmark ID, the landmark name, and a
> count of links associated with that landmark. Below is a SQL statement
> that although is illegal, gives a good idea of what I'm looking for.
>
> select r.rtid, r.rtname, l.count(*) from route r, links l where l.lktype =
> 'R' and l.lklid = r.rtid;
You'll want to GROUP BY
SELECT r.rtid, r.rtname, l.count(*) FROM route r, links l WHERE l.lktype='R'
AND l.lklid=r.rtid GROUP BY r.rtid, r.rtname;
--
Richard Huxton
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