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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
));
解题思路
表的连接时基础,之后的思路参考这篇博客的第一个思路
AC代码
SELECT s.emp_no, salary, last_name, first_name FROM salaries s, employees e WHERE (
to_date = '9999-01-01' AND
e.emp_no = s.emp_no AND
salary IN (
SELECT MAX(salary) FROM salaries WHERE (
to_date = '9999-01-01' AND
salary NOT IN (
SELECT MAX(salary) FROM salaries WHERE (
to_date = '9999-01-01'
)
)
)
)
)