标签:Customer customer 584 Referee Write table query NULL id
Table: Customer
+-------------+---------+
| Column Name | Type |
+-------------+---------+
| id | int |
| name | varchar |
| referee_id | int |
+-------------+---------+
id
is the primary key column for this table.
Each row of this table indicates the id of a customer, their name, and the id of the customer who referred them.
Write an SQL query to report the names of the customer that are not referred by the customer with id = 2.
Return the result table in any order.
Solution
注意 \(NULL\) 的情况:使用 \(is\ NULL\) 来判断
点击查看代码
# Write your MySQL query statement below
# Write your MySQL query statement below
SELECT
name
FROM
Customer
WHERE
referee_id != 2 OR referee_id is NULL;
标签:Customer,customer,584,Referee,Write,table,query,NULL,id 来源: https://www.cnblogs.com/xinyu04/p/16683393.html
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