How much are all robots?
$sum = Robots::sum(array('column' => 'price'));
echo "The total price of robots is ", $sum, "\n";
How much are mechanical robots?
$sum = Robots::sum(array("type='mechanical'", 'column' => 'price'));
echo "The total price of mechanical robots is ", $sum, "\n";
public static function sum($column, $parameters = null, $cacheOptions = null)
{
return self::_groupResult('SUM', 'summary', $column, $parameters, $cacheOptions = null);
}