使用另一个表中的查询删除一个表中的行

Question

我的数据库中有2个表。

表客户ID，firstName，lastName，地址......

和包含id，idCustomer ......的表命令。

我要删除名字为“john”的客户的所有订单

我如何编写命令？

感谢

Answer 1

DELETE o
FROM        Orders   o
INNER JOIN  Customer c ON o.idCustomer = c.ID
WHERE       c.firstName = 'john'

Answer 2

Delete From
    orders 
Where
    Orders.firstName In 
        (Select
            firstName 
        From
            customers
            Inner Join orders On customers.ID = orders.idCustomer
        Where
            customers.firstName = "john")