sql notes: leetcode#627 swap salary

Problem

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:

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

Analysis

Write a single update query:

1

UPDATE salary

Use IF() function to swap f and m, return f if sex is m, return m otherwise:

1

UPDATE salary SET sex = IF(sex='m', 'f', 'm');

Solution

1

UPDATE salary SET sex = IF(sex='m', 'f', 'm');

Link

627. Swap Salary
(中文版) SQL 笔记: Leetcode#627 Swap Salary