题目描述:
已知某公司员工的employee表和department表,写一个sql查询语言找出每个部门工资排前三的员工信息。
employee:
department:
输出结果:
题目解答
where条件语句的意思是:在该部门中比这三名员工中任一位工资高的人不超过3人。
SELECT d.Name AS 'Department', e1.Name AS 'Employee', e1.Salary
FROM
Employee e1
JOIN
Department d ON e1.DepartmentId = d.Id
WHERE
(SELECT
COUNT(DISTINCT e2.Salary)
FROM
Employee e2
WHERE
e2.Salary > e1.Salary
AND e1.DepartmentId = e2.DepartmentId
)<3