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copied!<p>The idea is to use <a href="http://dev.mysql.com/doc/refman/5.0/fr/date-and-time-functions.html#idp52185520" rel="nofollow"><code>TIMESTAMPDIFF</code></a> that will substract the <code>end_date</code> with the <code>start_date</code> :</p> <pre><code>$stoppage_part_sum[] = MouldingStoppage::find( array( 'select' => 'SUM( ABS(TIMESTAMPDIFF( MINUTE, IF(end_date > \''.date('Y-m-d H:00', $j).'\', \''.date('Y-m-d H:00', $j).'\', end_date), IF(start_date < \''.date('Y-m-d H:00', $i).'\', \''.date('Y-m-d H:00', $i).'\', start_date) )) ) as stoppage_qty', 'conditions' => array( 'moulding_product_id IN (?) AND end_date >= ? AND start_date <= ?', $this->product_id, date('Y-m-d H:00', $i), date('Y-m-d H:00', $j) ) ) )->stoppage_qty; </code></pre> <p>The <code>IF(end_date > ...)</code> and <code>IF(start_date < ...)</code>is to take only the time into the current window. It will then use this :</p> <pre><code>start_date: 08:00 end_date: 08:15 start_date: 08:19 end_date: 08:38 start_date: 08:45 end_date: 09:00 </code></pre> <p>Then you just <code>TIMESTAMPDIFF</code> <code>end_date</code> and <code>start_date</code> and <code>SUM</code> them. </p> <p>Note the condition to match the concerned "stoppages". (<code>start_date</code> < <strong>j</strong> and <code>end_date</code> > <strong>i</strong>)</p> <p><strong><a href="http://sqlfiddle.com/#!2/7f7825/11" rel="nofollow">The demo sqlFiddle</a></strong></p> <p>Try to change the dates in data to watch the result. </p>

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