Re: master-detail relationship and count

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