skip the two step process and use RAND in the sql statement
SELECT * FROM table1, table2 WHERE a=b AND c<d ORDER BY RAND() LIMIT 1000;
bastien
From: -{ Rene Brehmer }- <metalbunny@xxxxxxxxxxxxxx> To: php-db@xxxxxxxxxxxxx,php-general@xxxxxxxxxxxxx Subject: How to optimize select of random record in DB ? Date: Fri, 15 Oct 2004 07:41:44 +0200
I made this code to pick a random record from a changeable number of records in a given table.
I'm just curious if any of the more awake coders out there can see a way to optimize this for better performance, since there's several other DB queries on the same page.
$records = mysql_query("SELECT COUNT(*) AS count FROM persons") or die('Unable to get record count<br>'.mysql_error());
$totalcount = mysql_result($records,0) - 1;
$rndrecord = rand(0,$totalcount);
$personquery = mysql_query("SELECT personID FROM persons LIMIT $rndrecord,1") or die('Unable to get random record<br>'.mysql_error());
$personID = mysql_result($personquery,0);
--
Rene Brehmer
aka Metalbunny
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