# leetcode\_627

SQL架构 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    |

## Soltuions

1. **IF**

```sql
# Write your MySQL query statement below

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

1. **CASE**

```sql
# Write your MySQL query statement below

UPDATE salary
    SET sex = CASE sex
                WHEN 'm' THEN 'f'
                ELSE 'm'
              END;
```