前言
中午吃饭的时候无意中在QQ群里突然看到一道有趣的面试题,直到午休结束群里都没人回复第二道题的答案,可能是因为sql太长,大家懒得写了,遂开一篇文章记录一下,题目如下:
答案
1.简单的update语句,需要注意的是员工表中的age和salary都是int型
- UPDATE tbEmployee
- SET salary = salary + 200
- WHERE
- age >= 40
- AND salary < 2000;
2.涉及多表查询及子查询,可能我的sql写的有点长
- WITH emp AS (
- SELECT
- tbD. NAME,
- tbE. ID
- FROM
- tbDepartmemtEmployee tbDE
- LEFT JOIN tbEmployee tbE ON tbDE.employeeId = tbE. ID
- LEFT JOIN tbDepartment tbD ON tbDE. ID = tbD. ID
- WHERE
- tbE.age >= 40
- AND tbE.sqlary < 2000
- ) SELECT
- emp. NAME,
- COUNT (emp. NAME)
- FROM
- emp
- GROUP BY
- emp. NAME
- ORDER BY
- COUNT (emp. NAME) DESC