Table APP
柜台 |项目100001 |圆珠笔 100002 |铅笔 100003 |债券票据 100004 |标记
表Purchase_Order
柜台 |地位100001 |是的 100001 |是的 100001 |是的 100004 |不
我想删除app表和purchase_order表中的所有计数器100001。我该怎么做？
这是我的代码
应用.php
<a href="app.php?de='.$row["counter"].'">
if(isset($_GET['de']))
{
$del_id=$_GET['de'];
sql= ...
}
常规方法查询如下所示
DELETE a, p
FROM
(
SELECT 100001 counter
) q LEFT JOIN app a
ON q.counter = a.counter LEFT JOIN purchase_order p
ON q.counter = p.counter;
即使其中一个表中没有带有counter = 100001的行
这是 SQLFiddle 演示
尝试以下操作：
DELETE a.*, p.*
FROM app a
LEFT JOIN purchase_order p
ON p.counter = a.counter
WHERE a.counter = 100001
试试这个：
sql= "DELETE FROM a.*, b.* from app a LEFT JOIN purchase_order b
on a.counter=b.counter where a.counter=".$del_id;
尝试以下查询
DELETE a.*,b.* FROM app as a
LEFT JOIN purchase_order as b
ON a.counter=b.counter
WHERE a.counter=100001