I want to remove all records from 'feed_tag' where the feed_id foreign key
doesn't have any corresponding records in feed.
For instance I may have a record in feed_tag that is like (23, 10, 4543,
'... (some date)').
Then lets say there is no record in feed that has a primary id key of 10.
I
Hi Daevid
If you are using a foreign key you can set the reference as cascade
and when a row is deleted from feed it will be deleted from feed_tag.
http://dev.mysql.com/doc/refman/5.0/en/innodb-foreign-key-constraints.html
If you don't like it you can delete it easy with a query like this
Just do a left join with the delete query.
DELETE feed_tag FROM feed_tag LEFT JOIN feed ON
feed_tag.feed_id=feed.id WHERE feed.id IS NULL
That should do it. You can change DELETE feed_tag to SELECT and
test it first.
--
Brent Baisley
On Aug 13, 2008, at 4:51 PM, Daevid Vincent wrote:
