Dimitri Fontaine <dfonta...@hi-media.com> writes: > Tom Lane <t...@sss.pgh.pa.us> writes: >> foreach p2_member in unnest(p2) loop >> p1 := array(select period_except(p1_member, p2_member) >> from unnest(p1) p1_member); >> end loop; >> >> But maybe it can be done in a single SQL command.
> Yeah, as soon as you have LATERAL, I think. Without it there's no way to > compose SRF in SQL, AFAIK. Hm, how would you do it with LATERAL? The problem is not so much composition as the need for a variable number of rounds of composition. 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