Raymond C. Rodgers escribió: > The query in which I'm using array_accum() is building a > list of companies and the associated publishers for each. For example: > > SELECT c.company_id, c.company_name, array_accum(p.publisher_name) AS > publishers FROM company_table c LEFT JOIN company_publisher_assoc cpa ON > c.company_id = cpa.company_id LEFT JOIN publisher_table p ON > cpa.publisher_id = p.publisher_id GROUP BY c.company_id, c.company_name > ORDER BY company_name > > (This query isn't direct out of my code, and thus may have errors, but > it should convey the idea of what I'm trying to accomplish.) > > The result is that I should have a single row containing the company_id, > company_name, and publishers' names if any.
In order to do this you can use a custom aggregate function to concatenate the texts. I have described this previously here: http://archives.postgresql.org/message-id/20080327234052.GZ8764%40alvh.no-ip.org the text is in spanish but the SQL commands should be trivial to follow. I think this is a FAQ. -- Alvaro Herrera http://www.CommandPrompt.com/ PostgreSQL Replication, Consulting, Custom Development, 24x7 support -- Sent via pgsql-general mailing list (pgsql-general@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
