[LeetCode] 627.Swap Salary

[LeetCode] 627.Swap Salary

• 题目描述
• 解题思路
• 实验代码

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题目描述

Given a table salary, such as the one below, that has m=male and f=female values. Swap all f and m values (i.e., change all f values to m and vice versa) with a single update query and no intermediate temp table.

For example:

id	name	sex	salary
1	A	m	2500
2	B	f	1500
3	C	m	5500
4	D	f	500

After running your query, the above salary table should have the following rows:

id	name	sex	salary
1	A	f	2500
2	B	m	1500
3	C	f	5500
4	D	m	500

解题思路

SQL第二弹，觉得也没什么好说的，把每个“m”换成“f”，“f”换成“m”就解决问题了，具体见代码。

实验代码

# Write your MySQL query statement below
UPDATE salary
    SET sex  = (CASE WHEN sex = 'm' THEN 'f' ELSE 'm' END)