一道数据库的简单面试题

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：

题目.png

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