-- 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    |

-- # Write your MySQL query statement below

update salary set sex = CHAR(ASCII('f') ^ ASCII('m') ^ ASCII(sex));