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xuthus / 数据库SQL实战SQLMIT

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18.获取当前薪水第二多的员工的emp_no以及其对应的薪水salary2.md 1.00 KB
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xuthus authored 2019-08-13 08:38 . revise:content revision

获取当前薪水第二多的员工的emp_no以及其对应的薪水salary,不准使用order by

题目描述

查找当前薪水(to_date='9999-01-01')排名第二多的员工编号emp_no、薪水salary、last_name以及first_name,不准使用order by

CREATE TABLE `employees` (
`emp_no` int(11) NOT NULL,
`birth_date` date NOT NULL,
`first_name` varchar(14) NOT NULL,
`last_name` varchar(16) NOT NULL,
`gender` char(1) NOT NULL,
`hire_date` date NOT NULL,
PRIMARY KEY (`emp_no`));
CREATE TABLE `salaries` (
`emp_no` int(11) NOT NULL,
`salary` int(11) NOT NULL,
`from_date` date NOT NULL,
`to_date` date NOT NULL,
PRIMARY KEY (`emp_no`,`from_date`));

答案

select s.emp_no,salary,last_name,first_name from salaries s left join employees e on e.emp_no = s.emp_no where s.salary = (select max(salary) from salaries where to_date = '9999-01-01' and salary != (select max(salary) from salaries))

题解

1、先获得去除了最大值得数据集t1

2、再获得t1中的最大值

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