Re: [PHP] psql with PHP question

In my opinion, these queries make the same :
SELECT id FROM article WHERE id=(SELECT MAX(id) FROM article);
SELECT MAX(id) FROM article;

but the latter one is much more simple and you do not overload your pg.
(by the way, I think id = (SELECT ...) isn't handled gracefully.)

----- Original Message -----
From: "Jason" <gee308(at)mediaone(dot)net>
To: <pgsql-php(at)postgresql(dot)org>
Cc: <pgsql-novice(at)postgresql(dot)org>; <pgsql-general(at)postgresql(dot)org>
Sent: 2001. május 3. 14:06
Subject: [PHP] psql with PHP question

> Hi, I want to try and optimize my calls to postgreSQL from PHP. If
> I only need one field from a select statement, what should I use? I am
> currently using:
> $q = pg_Exec("SELECT id FROM article WHERE id=(SELECT MAX(id)
> FROM article)");
> $maxid = pg_fetch_array($q, 0);
> echo "The highest id is ". $maxid[0];
> What can I use besides an array to get a single value? In general, using
> a single variable always saves more memory than using an array? Thank
> you.
> Jason
>
>
> ---------------------------(end of broadcast)---------------------------
> TIP 5: Have you checked our extensive FAQ?
>
> http://www.postgresql.org/users-lounge/docs/faq.html