> I have a simple table:
>
> name, url, counter
>
> I want to be able to do:
>
> SELECT * FROM table ORDER BY counter limit 5;
>
> But, I want counter to be incremented by 1 *if* the row is included in
> that 5 ... so that those 5 basically move to the bottom of the list, and
> the next 5 come up ...
>
> I've checked CREATE TRIGGER, and that doesn't work 'ON SELECT' ... is
> there anything that I *can* do, other then fire back an UPDATE based on
> the records I've received?
>
> Thanks ...
>
You mean that you want to write a SELECT statement that returns the 5 first rows that have the smallest counter, and
justafter what, you would like to increment their counter, right?
I was thinking of using a table function, something like (I didn't test it):
CREATE OR REPLACE FUNCTION my_first_url(P_Limit IN int) RETURNS SETOF table
AS $$
BEGIN FOR V_Record IN SELECT * FROM table ORDER BY counter LIMIT P_Limit LOOP UPDATE table SET
counter= counter + 1 WHERE name = V_Record.name /* AND url = V_Record.url */; -- if needed
RETURN V_Record; END LOOP;
END;
$$ LANGUAGE PLPGSQL;
--
Daniel