Hi Kenneth
Thats exactly what i want, because we are running more selects than
inserts, and therefore a view is not the best way to go.
But I still have a problem, I was doing like you told me.
I have still the same table (without the rules definition)
So I created a trigger function:

CREATE FUNCTION trigger_test()
        RETURNS TRIGGER
        AS 'BEGIN
                new.c = (new.a + new.b);
                RETURN new;
        END;'
LANGUAGE 'plpgsql';

and then the Trigger:

CREATE TRIGGER trigger_sum
        AFTER INSERT OR UPDATE
        ON test
        FOR EACH ROW
        EXECUTE PROCEDURE trigger_test();

The inserting and updating is doing well, but its not summing up the a
and b and save it to the c column. So far maybe you can help me second
time.
Thanks,
Bert


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