将平均函数放在where子句中

Question

我想要显示所有员工的平均工资高于平均水平的员工编号，姓氏和薪水，并按升序排列结果。但是，我已经收到错误'组功能不允许在这里'。我应该如何写它？

select employee_id,last_name,salary from employees 
where salary > avg(salary) 
order by salary; 

Answer 1

select a.employee_id,a.last_name,a.salary from employees a 
where a.salary > (select avg(b.salary) from employees b) 
order by a.salary; 

Answer 2

使用AVG() OVER()窗口集合函数

select * from 
(
select employee_id,last_name,salary,avg(salary)over() as avg_salary from employees 
) e 
where salary > avg_salary 
order by salary;