"hx.li" <fly2nn@xxxxxxx> writes: > ERROR: FULL JOIN is only supported with merge-joinable join conditions > My question is: why on clause restrict "t_1.a=1"? It's an implementation restriction. If the clauses aren't mergejoinable there's no very practical way to keep track of which inner-side rows have had a match. > I test it in Oracle, it support to such as "t_1.a=1": I'd be interested to know how whatever they're doing scales to very large joins. regards, tom lane -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
