Martijn van Oosterhout <klep...@svana.org> writes: > Would it not be possible to use WITH here, like:
> WITH bar AS ( ... subselect ... ) > INSERT INTO foolog VALUES (bar.a, bar.b, ...) Don't think it works if the sub-select is correlated. Consider something like UPDATE summary_table s SET (sumx, sumy) = (SELECT sum(x), sum(y) FROM detail_table d WHERE d.group = s.group) and suppose we have a logging rule like the above on summary_table. You can't push the sub-select into a WITH because it depends on s.group. With sufficient intelligence you could rewrite the query entirely, I guess, but no simple transformation is going to cope. But come to think of it, WITH is already an interesting precedent: if you look into rewriteHandler.c you'll notice a boatload of corner cases where the rewriter just throws up its hands for various combinations of rules and statements containing WITH. So maybe that lends a bit more weight to Andres' position that it's okay to consider this an unimplemented feature. regards, tom lane -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers