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Doc: clarify the restrictions of AFTER triggers with transition tables.

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It was not very clear that the triggers are only allowed on plain tables
(not foreign tables).  Also, rephrase the documentation for better
readability.

Follow up to commit 9e6104c66.

Reported-by: Etsuro Fujita <etsuro.fujita@gmail.com>
Author: Ashutosh Bapat <ashutosh.bapat.oss@gmail.com>
Reviewed-by: Etsuro Fujita <etsuro.fujita@gmail.com>
Discussion: https://postgr.es/m/CAPmGK16XBs9ptNr8Lk4f-tJZogf6y-Prz%3D8yhvJbb_4dpsc3mQ%40mail.gmail.com
Backpatch-through: 13
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Etsuro Fujita
2025-08-02 18:30:00 +09:00
parent 11de339aad
commit 5a900d6482
1 changed files with 5 additions and 3 deletions
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8
doc/src/sgml/ref/create_trigger.sgml
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@@ -197,9 +197,11 @@ CREATE [ OR REPLACE ] [ CONSTRAINT ] TRIGGER <replaceable class="parameter">name
of the rows inserted, deleted, or modified by the current SQL statement. of the rows inserted, deleted, or modified by the current SQL statement.
This feature lets the trigger see a global view of what the statement did, This feature lets the trigger see a global view of what the statement did,
not just one row at a time. This option is only allowed for not just one row at a time. This option is only allowed for
an <literal>AFTER</literal> trigger that is not a constraint trigger; also, if an <literal>AFTER</literal> trigger on a plain table (not a foreign table).
the trigger is an <literal>UPDATE</literal> trigger, it must not specify The trigger should not be a constraint trigger. Also, if the trigger is
a <replaceable class="parameter">column_name</replaceable> list. an <literal>UPDATE</literal> trigger, it must not specify
a <replaceable class="parameter">column_name</replaceable> list when using
this option.
<literal>OLD TABLE</literal> may only be specified once, and only for a trigger <literal>OLD TABLE</literal> may only be specified once, and only for a trigger
that can fire on <literal>UPDATE</literal> or <literal>DELETE</literal>; it creates a that can fire on <literal>UPDATE</literal> or <literal>DELETE</literal>; it creates a
transition relation containing the <firstterm>before-images</firstterm> of all rows transition relation containing the <firstterm>before-images</firstterm> of all rows