标签:bsp select name query 客户 sele write -- div
某网站包含两个表,Customers
表和 Orders
表。编写一个 SQL 查询,找出所有从不订购任何东西的客户。
Customers
表:
+----+-------+ | Id | Name | +----+-------+ | 1 | Joe | | 2 | Henry | | 3 | Sam | | 4 | Max | +----+-------+
Orders
表:
+----+------------+ | Id | CustomerId | +----+------------+ | 1 | 3 | | 2 | 1 | +----+------------+
例如给定上述表格,你的查询应返回:
+-----------+ | Customers | +-----------+ | Henry | | Max | +-----------+
# Write your MySQL query statement below select Name as Customers from Customers where Id not in (select CustomerId from Orders)
标签:bsp select name query 客户 sele write -- div
原文地址:https://www.cnblogs.com/zyjdbk/p/9629648.html