MYSQL Simple
\nUPDATE Salary\nSET sex = CASE \n            WHEN sex = \'m\' THEN \'f\'\n            WHEN sex = \'f\' THEN \'m\'\n        END;\n
```\nUPDATE Salary\nSET sex = CASE \n            WHEN sex = \'m\' THEN \'f\'\n            WHEN sex = \'f\' THEN \'m\'\n        END;\n```
['MySQL']