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`));

输入描述:

无

输出描述:

emp_no	salary	last_name	first_name
10009	94409	Peac	Sumant

SQL:

select e.emp_no,max(s.salary) as salary,e.last_name,e.first_namefrom salaries s,employees eon e.emp_no=s.emp_nowhere s.salary not in(select max(salary) from salaries where to_date='9999-01-01') and s.to_date='9999-01-01'

　select 与max函数相互结合