On Thu, Oct 06, 2005 at 05:47:36PM -0500, Jeffrey Melloy wrote: > The only thing I could see actually being an issue is the random() one > and add missing from. The rest are trivial. The random() thing is > interesting, esoteric, and probably has never been a problem in a real > situation. (Or has exactly once, when he wrote that gotcha)
The random() issue has a workaround that the gotchas page doesn't mention: SELECT id, is_true FROM (SELECT id, RANDOM() < 0.5 AS is_true FROM some_table OFFSET 0) AS t_tmp WHERE is_true; Tom Lane brought up the OFFSET 0 trick a couple of days ago in the "Avoiding evaluating functions twice" thread: http://archives.postgresql.org/pgsql-general/2005-10/msg00107.php -- Michael Fuhr ---------------------------(end of broadcast)--------------------------- TIP 6: explain analyze is your friend
