如何使用MySQL计算两个日期/时间之间的总持续时间
我有一个名为it_的表,如下所示:如何使用MySQL计算两个日期/时间之间的总持续时间,mysql,Mysql,我有一个名为it_的表,如下所示: office | start | end | total ------------------------------------------------------------ nyc | 2014-07-01 20:56:00 | 2014-07-01 22:19:00 | 01:23 | ewi | 2014-07-17 17:35:00 | 2014-07-17 18:05:00
office | start | end | total
------------------------------------------------------------
nyc | 2014-07-01 20:56:00 | 2014-07-01 22:19:00 | 01:23 |
ewi | 2014-07-17 17:35:00 | 2014-07-17 18:05:00 | 00:30 |
nyc | 2014-07-11 03:09:00 | 2014-07-11 03:26:00 | 00:17 |
------------------------------------------------------------
所以,基本上,它只是显示office何时停机以及停机时间。如何计算(添加)纽约市办公室的总时间?所以,我希望输出是01:40(合并01:23+00:17)
我的查询如下所示(我使用的是Joomla 3.3):
您必须将查询结果放入下面的代码中
$i=0;
foreach( $results as $row)
{
if($i == 0 ){
$dt = DateTime::createFromFormat('H:i', $row['total']);
}
$arr = explode(':',$row['total']);
$dt->add(new DateInterval('PT'.$arr[0].'H'));
$dt->add(new DateInterval('PT'.$arr[1].'M'));
$i++;
}
/* Total time */
echo $dt->format('H:i');
使用Joomla db对象尝试以下mySQL:
$db = JFactory::getDbo();
$query = $db->getQuery(true);
$query->select("office,`start`,`end`,SEC_TO_TIME( SUM((UNIX_TIMESTAMP(`end`) - UNIX_TIMESTAMP(`start`))) ) AS total_outage");
$query->from($db->quoteName('#__outage'));
$query->group('office');
$db->setQuery($query);
foreach($result= $db->loadObjectList() as $outage) {
echo $outage->office . " : " . $outage->total_outage . '<Br/>';
}
您想用SQL还是PHP来实现这一点?
$db = JFactory::getDbo();
$query = $db->getQuery(true);
$query->select("office,`start`,`end`,SEC_TO_TIME( SUM((UNIX_TIMESTAMP(`end`) - UNIX_TIMESTAMP(`start`))) ) AS total_outage");
$query->from($db->quoteName('#__outage'));
$query->group('office');
$db->setQuery($query);
foreach($result= $db->loadObjectList() as $outage) {
echo $outage->office . " : " . $outage->total_outage . '<Br/>';
}
ewi : 00:30:00
nyc : 01:40:00