I've run in to this situation before. And it turns out that the extra pre-"count" query is not worth it. So the steps become: 1) Do your main query and fetch the results. 2) Use the count of results obtained in step 1. 3) Calculate pagination numbers. 4) Use array_slice to limit the results to a page window calculated in step 3. Hope this helps. - Aman Patel, Sys Admin / Database / Web Developer, International Outreach x4076 > -----Original Message----- > From: Zouari Fourat [mailto:fourat@xxxxxxxxx] > Sent: Tuesday, March 22, 2005 10:03 AM > To: php-db@xxxxxxxxxxxxx > Subject: Re: paginating : optimising queries > > > no one can help me outta here ? > > > On Mon, 21 Mar 2005 01:58:10 +0100, Zouari Fourat > <fourat@xxxxxxxxx> wrote: > > Hello, > > i made my own paginating class, it permit me to paginate > over selected > > data and let me do good presentation (page 1, page 2 ...) i > use adodb > > for db related functions, my application should show in every page > > this set of informations : > > > > Total results : Z, Total page : Y, You are on the page number X. > > > > To show thos informations, i must do a count on all the > table, example > > : the query built from the form submitted by the user is : > > > > select * from table where column=value and column like 'value%' > > > > to paginate that query, i'll add some LIMIT or LIMIT OFFSET > for pgsql > > (it's adodb frontend) so i'll get only the data for one > page ! i use > > this query : > > > > select count(*) from table > > > > with that global count i can calculate how much pages i have by > > dividing count on the number of rows to show per page. > > > > with this method, the server will suffer for big tables... it's a > > method that i've made without consulting what people do, can you do > > this with only ONE query so i can optimise ? > > > > thank you for your help > > > > -- > PHP Database Mailing List (http://www.php.net/) > To unsubscribe, visit: http://www.php.net/unsub.php > > -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
