> If I had set the primary key to (diag_id, create_time) would simple > queries on > diag_id still work well i.e. > select * from tdiag where diag_id = 1234; Yes. IIRC the performance penalty for using non-leading column of an index is negligible. But why don't you try that on your own - just run an explain and you'll get an immediate answer if that works. regards Tomas -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
