Re: [PHP-DB] multiple tables and amounts
hi! thanks a lot for your answer. i also thought of dividing the problem into several selects, but the application i'm working with (it's designed by a friend of mine, which lets you easily generate XML out of an sql) only accepts one single query.. do you know about any problems using CREATE TEMPORARY TABLE - eg. when there are a lot of users accessing the page? thx for your help again! -mathew # die welt ist schnell geworden... Von: Hutchins, Richard [EMAIL PROTECTED] Antworten an: [EMAIL PROTECTED] Datum: Thu, 29 Jan 2004 08:25:03 -0500 An: '[EMAIL PROTECTED]' [EMAIL PROTECTED] Betreff: RE: [PHP-DB] multiple tables and amounts Matt, What about this (assuming MySQL): //$photoid is whatever photo you want the details for. $sql_a = SELECT id FROM comments WHERE phid = '.$photoid.'; $sql_b = SELECT id FROM ratings WHERE phid = '.$photoid.'; $result_a = mysql_query($sql_a) or die(mysql_error()); $num_comments = mysql_num_rows($result_a); $result_b = mysql_query($sql_b) or die(mysql_error()); $num_ratings = mysql_num_rows($result_b); echo There were .$num_comments. comments and .$num_ratings. for that photo.; Since you're not doing anything really difficult with the queries, you probably won't see much of a speed hit by doing back-to-back queries like this. Besides, I think doing two straight queries like this is going to be faster than creating and deleting temporary tables. Just a guess. -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP-DB] multiple tables and amounts
hi! yes - it seems as if there was no way out. i'll have to render it without this php-class. i didn't thought that it's not possible to do such queries in sql - well at least i don't know how to do them?? :/ thx for your answers! -mathew # life would be easier if i knew the source code... Von: Robert Sossomon [EMAIL PROTECTED] Organisation: Garland C Norris Company Antworten an: [EMAIL PROTECTED] Datum: Thu, 29 Jan 2004 11:10:04 -0500 An: [EMAIL PROTECTED] Betreff: RE: [PHP-DB] multiple tables and amounts I may be able to hack the XML code to do it, but with wanting a COUNT of each based on the ID, it is going to be difficult to do it in 1 query only, in my opinion at least... Is there a way to out-think the XML generation to grab the items you need? -Original Message- From: ma [mailto:[EMAIL PROTECTED] Sent: Thursday, January 29, 2004 10:40 AM To: PHP-DB Subject: Re: [PHP-DB] multiple tables and amounts hi! thanks a lot for your answer. i also thought of dividing the problem into several selects, but the application i'm working with (it's designed by a friend of mine, which lets you easily generate XML out of an sql) only accepts one single query.. do you know about any problems using CREATE TEMPORARY TABLE - eg. when there are a lot of users accessing the page? thx for your help again! -mathew # die welt ist schnell geworden... Von: Hutchins, Richard [EMAIL PROTECTED] Antworten an: [EMAIL PROTECTED] Datum: Thu, 29 Jan 2004 08:25:03 -0500 An: '[EMAIL PROTECTED]' [EMAIL PROTECTED] Betreff: RE: [PHP-DB] multiple tables and amounts Matt, What about this (assuming MySQL): //$photoid is whatever photo you want the details for. $sql_a = SELECT id FROM comments WHERE phid = '.$photoid.'; $sql_b = SELECT id FROM ratings WHERE phid = '.$photoid.'; $result_a = mysql_query($sql_a) or die(mysql_error()); $num_comments = mysql_num_rows($result_a); $result_b = mysql_query($sql_b) or die(mysql_error()); $num_ratings = mysql_num_rows($result_b); echo There were .$num_comments. comments and .$num_ratings. for that photo.; Since you're not doing anything really difficult with the queries, you probably won't see much of a speed hit by doing back-to-back queries like this. Besides, I think doing two straight queries like this is going to be faster than creating and deleting temporary tables. Just a guess. -- 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
RE: [PHP-DB] multiple tables and amounts
// This is just 1 query, I have not tested it, but it may work. $get_Quote = select ph.id, ph.img, cm.id, cm.phid, cm.txt, rt.id, rt.phid, rt.text from photos as ph left join comments as cm left join ratings as rt on ph.id = cm.phid = rt.phid where id = '$photo_id' order by ph.id; //runs the query $get_Quote_res = mysql_query($get_Quote) or die(mysql_error()); -Original Message- From: ma [mailto:[EMAIL PROTECTED] Sent: Wednesday, January 28, 2004 10:21 PM To: PHP-DB Subject: [PHP-DB] multiple tables and amounts hi! i have a weired problem: there are 3 tables: photos (id, img) comments (id, phid, text) ratings (id, phid, text) now i tried to create a query returning the amount of ratings and the amount of comments for all images in the photo-table. i tried it with multiple joins, but without success... but i ended up using some CREATE TEMPORARY TABLE syntax - is there a way to do it one-query? CREATE TEMPORARY TABLE comments_temp SELECT comments.id, comments.phid, COUNT(comments.id) AS ratings FROM comments LEFT JOIN ratings ON ratings.phid=comments.phid WHERE comments.phid=1 GROUP BY comments.phid, comments.id; SELECT photos.*, COUNT(photos.id) AS comments, comments_temp.ratings FROM photos LEFT JOIN comments_temp ON comments_temp.phid = photos.id WHERE gid=1 GROUP BY photos.id; DROP TABLE comments_temp; as said i would like to do it one-query, because it does not seem to me being a simple and beautiful solution?? help would be warmly appretiated... thx alot - mathew # life would be easier if i knew the source code... -- 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
Re: [PHP-DB] multiple tables and amounts
thx for the query! unfortunately it does not what i was aiming for... a result like this: id | img | comments | ratings ---+-+--+ 1 | p.jpg | 0| 1 2 | a.jpg | 3| 4 3 | v.png | 2| 0 so the variable to set dynamicall should be compared to gid (id from the gallery-table). i found that the problem with two joins is, that the group-by-methods get applyed to all rows, so i cannot differ the amount of comments and ratings. the only possibility is to find it out via php, but this is not what i'm aiming for.. thanks for your answer! -mathew # life would be easier if i knew the source code... Von: Robert Sossomon [EMAIL PROTECTED] Organisation: Garland C Norris Company Antworten an: [EMAIL PROTECTED] Datum: Thu, 29 Jan 2004 11:17:55 -0500 An: [EMAIL PROTECTED], 'PHP-DB' [EMAIL PROTECTED] Betreff: RE: [PHP-DB] multiple tables and amounts // This is just 1 query, I have not tested it, but it may work. $get_Quote = select ph.id, ph.img, cm.id, cm.phid, cm.txt, rt.id, rt.phid, rt.text from photos as ph left join comments as cm left join ratings as rt on ph.id = cm.phid = rt.phid where id = '$photo_id' order by ph.id; //runs the query $get_Quote_res = mysql_query($get_Quote) or die(mysql_error()); -Original Message- From: ma [mailto:[EMAIL PROTECTED] Sent: Wednesday, January 28, 2004 10:21 PM To: PHP-DB Subject: [PHP-DB] multiple tables and amounts hi! i have a weired problem: there are 3 tables: photos (id, img) comments (id, phid, text) ratings (id, phid, text) now i tried to create a query returning the amount of ratings and the amount of comments for all images in the photo-table. i tried it with multiple joins, but without success... but i ended up using some CREATE TEMPORARY TABLE syntax - is there a way to do it one-query? CREATE TEMPORARY TABLE comments_temp SELECT comments.id, comments.phid, COUNT(comments.id) AS ratings FROM comments LEFT JOIN ratings ON ratings.phid=comments.phid WHERE comments.phid=1 GROUP BY comments.phid, comments.id; SELECT photos.*, COUNT(photos.id) AS comments, comments_temp.ratings FROM photos LEFT JOIN comments_temp ON comments_temp.phid = photos.id WHERE gid=1 GROUP BY photos.id; DROP TABLE comments_temp; as said i would like to do it one-query, because it does not seem to me being a simple and beautiful solution?? help would be warmly appretiated... thx alot - mathew # life would be easier if i knew the source code... -- 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 -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
