题目描述
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`));
输出格式:
avg_salary |
---|
69462.5555555556 |
select avg(salary)as avg_salary
from salaries
where to_date='9999-01-01'
and salary <>(select max(salary)from salaries where to_date='9999-01-01')
and salary <>(select min(salary)from salaries where to_date='9999-01-01')