On Mon, May 03, 2004 at 18:08:23 +0200, Timo Nentwig <[EMAIL PROTECTED]> wrote: > > This is very slow:
This kind of question should be asked on the performance list. > > SELECT urls.id FROM urls WHERE > ( > urls.id <> ALL (SELECT html.urlid FROM html) > ); > > ...while this is quite fast: You didn't provide your postgres version or an explain analyze so it is hard to answer your question definitivly. Most likely you are using a pre 7.4 version which is know to be slow for IN (which is what the above probably gets translated to). > > SELECT urls.id FROM urls WHERE > ( > NOT (EXISTS (SELECT html.urlid FROM tml WHERE > ( > html.urlid = urls.id > ))) > ); ---------------------------(end of broadcast)--------------------------- TIP 1: subscribe and unsubscribe commands go to [EMAIL PROTECTED]
