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I want to update and delete using the result of a join. If I create a
table first containing the rows to modify can I safely join to it for
the update or delete?
I don't know why you would need to use a second table; if you want to you
can, but don't do it without reason (such as needing a "list" of
purged/changed items - which you could get from journal anyway).
In either case, have a look at WHERE EXISTS.
DELETE FROM mytable WHERE EXISTS
SELECT 1 from yourtable where (condition to be deleted)
Dennis Lovelady
http://www.linkedin.com/in/dennislovelady
--
"You can make more friends in two months by becoming interested in other
people than you can in two years by trying to get other people interested in
you."
-- Dale Carnegie
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