On Fri, Jun 12, 2020 at 09:09:09AM +0000, PG Doc comments form wrote:
> The following documentation comment has been logged on the website:
>
> Page: https://www.postgresql.org/docs/12/bug-reporting.html
> Description:
>
> Hi
> I was stumbling across the trigger function
> ‘suppress_redundant_updates_trigger’ in
> https://www.postgresql.org/docs/devel/functions-trigger.html and I would
> just ask if there is any reason of this not being int the documentation in
> https://www.postgresql.org/docs/13/sql-createtrigger.html.
> So after
>
> Call a function to log updates of accounts, but only if something changed:
>
> CREATE TRIGGER log_update
> AFTER UPDATE ON accounts
> FOR EACH ROW
> WHEN (OLD.* IS DISTINCT FROM NEW.*)
> EXECUTE FUNCTION log_account_update();
>
> There could be an alternative implementation as well
>
> CREATE TRIGGER log_update
> AFTER UPDATE ON accounts
> FOR EACH ROW
> EXECUTE FUNCTION log_account_update();
>
> CREATE TRIGGER suppress_redundant_account_after_updates
> AFTER UPDATE ON accounts
> FOR EACH ROW EXECUTE FUNCTION suppress_redundant_updates_trigger();
>
>
> Just to introduce and like the feature.
>
> Thank you for your great work best regards
I have created the attached patch to mention
suppress_redundant_updates_trigger() in this case. I don't think having
an actual example is warranted.
--
Bruce Momjian <[email protected]> https://momjian.us
EnterpriseDB https://enterprisedb.com
The usefulness of a cup is in its emptiness, Bruce Lee
diff --git a/doc/src/sgml/ref/create_trigger.sgml b/doc/src/sgml/ref/create_trigger.sgml
index 303881fcfb..8cfac0fbc6 100644
--- a/doc/src/sgml/ref/create_trigger.sgml
+++ b/doc/src/sgml/ref/create_trigger.sgml
@@ -582,7 +582,9 @@ CREATE TRIGGER check_update
</programlisting>
Call a function to log updates of <literal>accounts</literal>, but only if
- something changed:
+ something changed
+ (<function>suppress_redundant_updates_trigger()</function> can also be
+ helpful here):
<programlisting>
CREATE TRIGGER log_update
