From: | Oisin Glynn <me(at)oisinglynn(dot)com> |
---|---|
To: | Bert <clemens(dot)bertschler(at)gmail(dot)com> |
Cc: | pgsql-general(at)postgresql(dot)org |
Subject: | Re: SQL Rule |
Date: | 2006-04-25 21:41:05 |
Message-ID: | 444E9771.803@oisinglynn.com |
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Thread: | |
Lists: | pgsql-general |
Could you create the table without the C column
then create a view test_view with
select a,b,a+b as c,id from test;
Oisin
Bert wrote:
> Hi list
>
> I have a table construction like the one seen below, when i am updating
> or inserting i get a recurion, logical. But how to manage it that the
> rule is just doing it one time. Or is it possible to do the sum of a
> and b in an other way?
>
> CREATE TABLE test
> (
> a int2,
> b int2,
> c int2,
> id int2 NOT NULL,
> CONSTRAINT id_test PRIMARY KEY (id)
> )
> WITHOUT OIDS;
> ALTER TABLE test OWNER TO postgres;
>
>
> CREATE OR REPLACE RULE sum_op AS
> ON INSERT TO test DO UPDATE test SET c = new.a + new.b
> WHERE test.id = new.id;
>
> CREATE OR REPLACE RULE sum_op_up AS
> ON UPDATE TO test DO UPDATE test SET c = test.a + test.b
> WHERE test.id = new.id;
>
>
> ---------------------------(end of broadcast)---------------------------
> TIP 6: explain analyze is your friend
>
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