Re: Trigger on a column

Hi,

readding around I just found this:
The CREATE TRIGGER statement in PostgreSQL implements a subset of the
SQL99 standard. (There are no provisions for triggers in SQL92.) The
following functionality IS MISSING:
* SQL99 allows triggers to fire on updates to specific columns (e.g.,
AFTER UPDATE OF col1, col2).
* .....

Does anybody know if that's true on version postgresql (PostgreSQL)
8.1.2? Because I don't actually know from what version that sentence is.

Thanks in advance

William Leite Araújo wrote:

> http://www.postgresql.org/docs/8.1/interactive/sql-createtrigger.html :
>
> CREATE TRIGGER -- define a new trigger
>
>
> Synopsis
>
>CREATE TRIGGER /name/ { BEFORE | AFTER } { /event/ [ OR ... ] }
>
> ON /table/ [ FOR [ EACH ] { ROW | STATEMENT } ]
> EXECUTE PROCEDURE /funcname/ ( /arguments/ )
>
>
> There is not a way to create column level trigger. If the trigger
> don't block the insert/update/delete, you can try an "after trigger"
> that do all insertions once.
>
> 2006/2/6, Josep Sanmartí <josep(dot)sanmarti(at)openwired(dot)net
> <mailto:josep(dot)sanmarti(at)openwired(dot)net>>:
>
> Hi,
>
> My trigger's running on a table that works perfectly. This trigger
> calls
> a function that inserts or modifies a row of a different table. My
> problem is that I need to optimize this trigger, and the only way
> that
> I've found is to fire the trigger when certain table fields are
> modified. I do it like this:
>
> CREATE TRIGGER tr_barra_aps AFTER INSERT OR DELETE OR UPDATE OF status
> ON am_access_point EXECUTE PROCEDURE f_barra_aps();
>
> but I get this error:
> ERROR: syntax error at or near "status" at character 62
>
> The status field is correct. Can anybody help me?
>
> Thanks
>
> --
> Josep Sanmarti
> Analista de Projectes
>
> OpenWired
> Caballero 87 - Bajos
> 08029 - Barcelona
> Tel. 93 495 0990
> Fax. 93 419 4591
>
> Openwired
> Alejandro Villegas,29
> 28043 - MADRID - ESPAÑA
> Teléfono: 91 300 51 09
> Fax: 91 300 28 13
> http://www.openwired.com
>
>
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>
>
>
> --
> William Leite Araújo

--
Josep Sanmarti
Analista de Projectes

OpenWired
Caballero 87 - Bajos
08029 - Barcelona
Tel. 93 495 0990
Fax. 93 419 4591

Openwired
Alejandro Villegas,29
28043 - MADRID - ESPAÑA
Teléfono: 91 300 51 09
Fax: 91 300 28 13
http://www.openwired.com