Re: SQL Rule

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)---------------------------
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>