Question

我有以下由PHP脚本执行的SQL查询。问题是，即使不满足$nameValue参数，它仍然会返回值。如何解决？我专门说：

WHERE ((driver_name = '$nameValue') AND
        status = 'FEDEX' or status = 'UPS')

AND仅在同时满足两个条件时返回，但仍显示状态为FEDEX或UPS

的所有内容。

$sql =  "SELECT customer,
       sum( status = 'FEDEX' ) as PickedUpNUM,
       sum( status = 'UPS' ) as DeliveryNUM
        from Equipment
        WHERE ((driver_name = '$nameValue') AND
        status = 'FEDEX' or status = 'UPS')
        group by customer
        Order by DeliveryNUM DESC";

Answer 1

错误（）位置

$sql =  "SELECT customer,
          sum( status = 'FEDEX' ) as PickedUpNUM,
          sum( status = 'UPS' ) as DeliveryNUM
          from Equipment
          WHERE driver_name = '$nameValue' AND
          (status = 'FEDEX' or status = 'UPS')
        group by customer
        Order by DeliveryNUM DESC";

Answer 2

要使查询返回所需的结果，您需要进行一些更改

$sql =  "SELECT customer,
          sum( IF(status = 'FEDEX', 1, 0 ) as PickedUpNUM,
          sum( IF(status = 'UPS', 1, 0 ) as DeliveryNUM
          from Equipment
          WHERE driver_name = '$nameValue' AND
          (status = 'FEDEX' or status = 'UPS')
        group by customer
        Order by DeliveryNUM DESC";

当不满足条件参数时，为什么我的SQL会给我结果

2 个答案: