Re: making multiple updates use indexes: howto?

On Mon, Jul 07, 2003 at 05:58:00PM -0400, Mike Mascari wrote:
> 2. I've found the following syntax to perform better, although I'm not
> sure of its portability:
>
> UPDATE stockline SET status = 3
> WHERE stockline.id = lap_mpdetail_view.id AND
> lap_mpdetail_view.lap = 3976;

Very un-portable. PGSQL is the only database I know of that will
construct a FROM clause for you on it's own. You should at least add

FROM lap_mpdetail_view

to the update. Even that isn't highly portable, though at least some
databases support that syntax. (Sybase and MS SQL come to mind).

--
Jim C. Nasby, Database Consultant                  jim@nasby.net
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