In response to Eus : > Hi Ho! > > Is there a way to check whether or not a subquery returns an empty result set?
You can use EXISTS for that: -- empty result test=*# select * from (select 1 where 1=2) foo; ?column? ---------- (0 rows) -- check if a result exists test=*# select exists(select * from (select 1 where 1=2) foo); ?column? ---------- f (1 row) test=*# select exists(select * from (select 1 where 1=1) foo); ?column? ---------- t (1 row) Regards, Andreas -- Andreas Kretschmer Kontakt: Heynitz: 035242/47150, D1: 0160/7141639 (mehr: -> Header) GnuPG-ID: 0x3FFF606C, privat 0x7F4584DA http://wwwkeys.de.pgp.net -- Sent via pgsql-general mailing list (pgsql-general@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
