627. Swap Salary

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    |`

Solution:

`update salary set sex= if (sex = 'f', 'm', 'f');`

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