SQL查询（Zend框架）

Question

如果另一列为1或2

，如何从同一列中减去

->from('product', array('SUM(weight)')
->where('store = 1')

如果存储设置为2，则应始终减去重量值。

Answer 1

如果可以，请继续尝试...

$selectCounting = $productsTable->select();
$selectCounting ->from('product', 
                       array('SUM(IF(store = 2, 0, weight)) AS `totalweight`', 
                      'product', 
                      'weight'))
                ->where ('1=1')