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 query and no intermediate temp table.

For example:

id name sex salary 1 A m 2500 2 B f 1500 3 C m 5500 4 D f 500

After running your query, 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

Answer1:

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

Answer2:

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