On Fri, Jun 14, 2013 at 7:31 AM, Dave Howorth <dhowo...@mrc-lmb.cam.ac.uk>wrote:
> My brain is feeling fried and is failing to solve a simple puzzle. > > Using the standard table 'artist' which has a primary key 'artistid'. > > And the other table 'cd' that has a link to artists, via a foreign key > 'artist'. There may be more than one CD associated with a single artistid. > > I want a resultset containing all artists which have NO associated CD. > > What's the appropriate way to select this resultset? > I think you'd want to do a left outer join where cd's primary key is null. SELECT * FROM artist LEFT OUTER JOIN cd ON artist.artistid = cd.artist WHERE cd.cdid IS NULL -- *Ronald J Kimball* Senior Developer - www.snapapp.com | Facebook <http://www.facebook.com/snapapp> *|* Twitter<http://www.twitter.com/snap_app>
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