On 2013-04-24, Stephen Scheck <singularsyntax@xxxxxxxxx> wrote: > --f46d043c810aa794a404db21f464 > Content-Type: text/plain; charset=ISO-8859-1 > > Possibly due to my lack of thorough SQL understanding. Perhaps there's a > better way of doing what I'm ultimately trying to accomplish, but still the > question remains - why does this work: > > pg_dev=# select unnest(array[1,2,3]); > unnest > -------- > 1 > 2 > 3 > (3 rows) > > But not this: > > pg_dev=# select array_agg(unnest(array[1,2,3])); > ERROR: set-valued function called in context that cannot accept a set the parser doesn't understand it for the reason given same as it doesn't understand this. select avg(generate_series(1,3)); but it does understand this: select avg(a) from generate_series(1,3) as s(a); and this: select array_agg(i) from unnest(array[1,2,3])) as u(i); -- ⚂⚃ 100% natural -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
