数据库每日一题 --- 第 16 天：计算特殊奖金

+-------------+---------+| 列名        | 类型     |+-------------+---------+| employee_id | int     || name        | varchar || salary      | int     |+-------------+---------+employee_id 是这个表的主键。此表的每一行给出了雇员id ，名字和薪水。

输入：Employees 表:+-------------+---------+--------+| employee_id | name    | salary |+-------------+---------+--------+| 2           | Meir    | 3000   || 3           | Michael | 3800   || 7           | Addilyn | 7400   || 8           | Juan    | 6100   || 9           | Kannon  | 7700   |+-------------+---------+--------+输出：+-------------+-------+| employee_id | bonus |+-------------+-------+| 2           | 0     || 3           | 0     || 7           | 7400  || 8           | 0     || 9           | 7700  |+-------------+-------+解释：因为雇员id是偶数，所以雇员id 是2和8的两个雇员得到的奖金是0。雇员id为3的因为他的名字以'M'开头，所以，奖金是0。其他的雇员得到了百分之百的奖金。

1.排序、case语句2.建议用时10~25min

select employee_id, case when (name not like 'M%' and employee_id % 2 = 1) then salary else 0 end as bonusfrom employeesorder by employee_id