update audit set key = (select extension.number from extension where audit.record_id = extension_id) On 19.02.2010, at 11:25, Gordon Ross wrote:
> I have two tables: > > Table "public.audit" > Column | Type | Modifiers > ------------+----------------------+----------- > id | integer | (serial) > record_id | integer | not null > key | character varying | > (...) > > > Table "public.extension" > Column | Type | Modifiers > ---------+------------+------------ > id | integer | (serial) > number | integer | > (...) > > > The column "key" was recently added to the "audit" table, and I wish to > populate it with the value form the "number" column in the extension table. > The join between the tables is audit.record_id = extension.id > > I tried: > > UPDATE audit SET key = extension.number FROM extension WHERE audit.record_id > = extension.number; > > But that returns saying "UPDATE 0" > > However, doing: > > SELECT audit.record_id, extension.number FROM audit, extension WHERE > audit.record_id = extension.id; > > Works fine. > > Can someone tell me what I'm doing wrong ? > > Thanks, > > GTG > > > -- > Sent via pgsql-sql mailing list (pgsql-sql@postgresql.org) > To make changes to your subscription: > http://www.postgresql.org/mailpref/pgsql-sql > -- Sent via pgsql-sql mailing list (pgsql-sql@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-sql
