implementation wise, count(*) is faster. Very easy to test: SELECT COUNT(*) FROM generate_series(1,100) a, generate_series(1,1000) b; SELECT COUNT(a) FROM generate_series(1,100) a, generate_series(1,1000) b; ;] -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
