Daniel Futerman wrote:
Is it possible to have UPDATE JOIN queries in PostgreSQL?
Yes:
UPDATE target
....
FROM othertable;
As far as I know Pg can only do an inner join on the update target. This
can be easily be turned into an outer join with something like:
UPDATE target
....
FROM target t LEFT OUTER JOIN othertable
WHERE target.id = t.id;
or similar. I haven't checked to see whether this results in an extra
scan in the query plan; you might want to use EXPLAIN ANALYZE to examine
how Pg will execute the query.
--
Craig Ringer
