note 89343 added to function.rand

From: Date: Wed, 04 Mar 2009 08:16:57 +0000
Subject: note 89343 added to function.rand
Groups: php.notes 
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Easy way for mysql: random row the original form is: "... order by rand()" but this is not the best way, because it's very slow by a big database (it can take more minutes to complete the request!) My suggestion: <?php // estimate the number of rows in a table $lekerdezes = mysql_query("select * from table"); $max = mysql_num_rows($lekerdezes); // pick one $rand = rand(1,$max); $lekerdezes2 = mysql_query("select * from table limit $rand, 1"); // that's all folks :) ?> ---- Server IP: 62.112.195.86 Probable Submitter: 84.2.147.147 ---- Manual Page -- http://www.php.net/manual/en/function.rand.php Edit -- https://master.php.net/note/edit/89343 Del: integrated -- https://master.php.net/note/delete/89343/integrated Del: useless -- https://master.php.net/note/delete/89343/useless Del: bad code -- https://master.php.net/note/delete/89343/bad+code Del: spam -- https://master.php.net/note/delete/89343/spam Del: non-english -- https://master.php.net/note/delete/89343/non-english Del: in docs -- https://master.php.net/note/delete/89343/in+docs Del: other reasons-- https://master.php.net/note/delete/89343 Reject -- https://master.php.net/note/reject/89343 Search -- https://master.php.net/manage/user-notes.php

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