627. Swap Salary

Description

SQL Schema

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 statement and no intermediate temp table.

Note that you must write a single update statement, DO NOT write any select statement for this problem.

Example:

| id | name | sex | salary |
|----|------|-----|--------|
| 1  | A    | m   | 2500   |
| 2  | B    | f   | 1500   |
| 3  | C    | m   | 5500   |
| 4  | D    | f   | 500    |
After running your update statement, 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    |

My Solution

Source Code

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UPDATE salary 
SET sex =
    (
        CASE
            WHEN sex = 'm' THEN 'f'
            ELSE 'm'
        END
    )

Analysis

This one was simple. It's basically just a CASE statement.

I'm starting to notice that all the leetcode SQL problems are either completely trivial or hard with nothing in between. ​