Tom Lane 7fc0f06221 Add a WHEN clause to CREATE TRIGGER, allowing a boolean expression to be ...

checked to determine whether the trigger should be fired.

For BEFORE triggers this is mostly a matter of spec compliance; but for AFTER
triggers it can provide a noticeable performance improvement, since queuing of
a deferred trigger event and re-fetching of the row(s) at end of statement can
be short-circuited if the trigger does not need to be fired.

Takahiro Itagaki, reviewed by KaiGai Kohei.

2009-11-20 20:38:12 +00:00

..

sgml

Add a WHEN clause to CREATE TRIGGER, allowing a boolean expression to be

2009-11-20 20:38:12 +00:00

Makefile

Ship documentation without intermediate tarballs

2009-08-09 22:47:59 +00:00