On tis, 2010-08-10 at 22:21 -0430, Jose Ildefonso Camargo Tolosa wrote: > And it works, it gives me something like: > > product_id | name | code | manufacturer_id | > manufacturer_name | num_serials > ------------+----------------------+---------------+-----------------+----------------------------+------------- > 17 | THE product | 1235711131719 | 19 | > THE product's manufacturer | 5 > 6 | Car Battery 500A 12V | 7591512021575 | 8 | > Acumuladores Duncan, C.A. | 11 > 1 | Test product 1 | 123456789012 | 1 | > Test Manufacturer | 6 > > Which is correct, and exactly what I wanted. > > So far, so good. The thing is: the group by clause, I had to add it > because the parser forced me to, because it complained like this: > > ERROR: column "manufacturer.name" must appear in the GROUP BY clause > or be used in an aggregate function > > and I had to include *all* the requested columns on the group by > clause, can anybody tell me why? or at least point to some doc that > help me understanding this?
This is fixed in PostgreSQL 9.1devel (*); there you only need to put the primary key into the GROUP BY clause. Earlier versions didn't know that that was enough to ensure a deterministic result. (*) -- It will probably be a bit over a year before that is released. -- Sent via pgsql-sql mailing list (pgsql-sql@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-sql