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 |
Code
UPDATE Salary SET sex = IF(sex = ‘f‘, ‘m‘, ‘f‘)
也就是说if sex == ‘f‘ , sex = ‘m‘
else: sex = ‘f‘
[LeetCode] 627. Swap Salary_Easy tag: SQL
原文：https://www.cnblogs.com/Johnsonxiong/p/9478792.html