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    <p>Here is the sample table structure I created:</p> <pre><code>-- SQL EXAMPLE CREATE TABLE IF NOT EXISTS `stack_test` ( `server` int(11) NOT NULL, `rtime` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP, `status` tinyint(4) NOT NULL ) ENGINE=MyISAM DEFAULT CHARSET=latin1; INSERT INTO `stack_test` (`server`, `rtime`, `status`) VALUES (1, '2012-01-01 11:00:24', 1), (1, '2012-01-01 11:02:24', 1), (1, '2012-01-01 11:05:24', 0), (2, '2012-01-01 11:10:24', 1), (1, '2012-01-01 11:30:24', 1); -- SQL EXAMPLE END </code></pre> <p>This is the PHP code:</p> <pre><code>&lt;?php $query = 'SELECT DISTINCT(`server`) `server` FROM stack_test'; $res = sql::exec($query); // replace with your function/method to execute SQL while ($row = mysql_fetch_assoc($res)) { $server = $row['server']; $uptimes = sql::exec('SELECT * FROM stack_test WHERE server=? ORDER BY rtime DESC',$server); $online = 0; $prev = time(); $prev = strtotime('2012-01-01 11:40:00'); // just to show that it works given the example while ($uptime = mysql_fetch_assoc($uptimes)) { if ($uptime['status'] == 1) { echo date('g:ia',$prev) . ' to ' . date('g:ia',strtotime($uptime['rtime'])) . ' = '.(($prev-strtotime($uptime['rtime']))/60).' mins&lt;br /&gt;'; $online += $prev-strtotime($uptime['rtime']); } $prev = strtotime($uptime['rtime']); } echo 'Server '.$server.' is up for '.($online/60).' mins.&lt;br /&gt;'; } ?&gt; </code></pre> <p>This is the output I get:</p> <pre><code>11:40am to 11:30am = 10 mins 11:05am to 11:02am = 3 mins 11:02am to 11:00am = 2 mins Server 1 is up for 15 mins. 11:40am to 11:10am = 30 mins Server 2 is up for 30 mins. </code></pre>
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    1. POAddition of time differences with where clause in mysql
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    1. COThat is an absolutely fantastic answer however I am trying to get as much SQL and as little PHP as possible. Problem being that there are hundreds of thousands of rows and transferring every row to php is proving too slow
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