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Add mention of no SELECT triggers.

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This commit is contained in:
Bruce Momjian 2001-11-29 22:18:14 +00:00
parent 636a939fe5
commit d1a2a01f38
1 changed files with 17 additions and 15 deletions
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32
doc/src/sgml/ref/create_trigger.sgml
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@ -1,5 +1,5 @@
<!--
$Header: /cvsroot/pgsql/doc/src/sgml/ref/create_trigger.sgml,v 1.18 2001/11/19 03:58:25 tgl Exp $
$Header: /cvsroot/pgsql/doc/src/sgml/ref/create_trigger.sgml,v 1.19 2001/11/29 22:18:14 momjian Exp $
Postgres documentation
-->
@ -117,20 +117,22 @@ CREATE
</para>
<para>
The trigger can be specified to fire either before BEFORE the
operation is attempted on a tuple (before constraints
are checked and the <command>INSERT</command>, <command>UPDATE</command> or
<command>DELETE</command> is attempted) or
AFTER the operation has been attempted (e.g., after constraints
are checked and the <command>INSERT</command>,
<command>UPDATE</command> or <command>DELETE</command> has
completed). If the
trigger fires before the event, the trigger may
skip the operation for the current tuple, or change the tuple
being inserted (for <command>INSERT</command> and
<command>UPDATE</command> operations only). If
the trigger fires after the event, all changes, including the
last insertion, update, or deletion, are <quote>visible</quote> to the trigger.
The trigger can be specified to fire either before BEFORE the
operation is attempted on a tuple (before constraints are checked and
the <command>INSERT</command>, <command>UPDATE</command> or
<command>DELETE</command> is attempted) or AFTER the operation has
been attempted (e.g., after constraints are checked and the
<command>INSERT</command>, <command>UPDATE</command> or
<command>DELETE</command> has completed). If the trigger fires before
the event, the trigger may skip the operation for the current tuple,
or change the tuple being inserted (for <command>INSERT</command> and
<command>UPDATE</command> operations only). If the trigger fires
after the event, all changes, including the last insertion, update,
or deletion, are <quote>visible</quote> to the trigger.
</para>
<para>
<command>SELECT</command> does not modify any rows so you can not
create <command>SELECT</command> triggers.
</para>
<para>