From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
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To: | "Nico Callewaert" <nico(dot)callewaert(at)ets-informatics(dot)com> |
Cc: | pgsql-novice(at)postgresql(dot)org |
Subject: | Re: Trigger function syntax |
Date: | 2007-11-08 15:28:36 |
Message-ID: | 24670.1194535716@sss.pgh.pa.us |
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Lists: | pgsql-novice |
"Nico Callewaert" <nico(dot)callewaert(at)ets-informatics(dot)com> writes:
> I don't understand the difference between the following syntax :
> CREATE FUNCTION "test_check_a_id" () RETURNS opaque AS '
> CREATE FUNCTION LAST_UPDATED() RETURNS "trigger" AS $$
> Especially the difference between opaque and "trigger".
Trigger is the recommended way of declaring triggers. Opaque was
the way to do it before we invented the separate trigger pseudo-type
(which happened in 7.3 IIRC ... a long time ago, anyway). Opaque
was serving so many different purposes that we felt it needed to be
split up --- see the table in
http://www.postgresql.org/docs/8.2/static/datatype-pseudo.html
> And the double quotes, seems sometimes used and sometimes not.
They don't make any difference in the above example. See
http://www.postgresql.org/docs/8.2/static/sql-syntax-lexical.html#SQL-SYNTAX-IDENTIFIERS
regards, tom lane
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