sql - Oracle显示所有工资高于部门平均水平的员工

Question

我正在编写一个查询来查找收入高于其部门平均工资的员工。我需要显示员工ID、工资、部门ID以及该部门的平均工资。

我有一个几乎可以工作的查询，但它一直给我“ORA-00904:“AVG_SAL”:无效标识符”错误。我这样做正确吗？为什么我会收到此无效标识符错误？

SELECT employee_id, salary, department_id,
  (SELECT ROUND(AVG(salary),2)
  FROM employees e_inner
  WHERE e_inner.department_id = e.department_id) AS avg_sal
FROM employees e
WHERE salary > avg_sal
ORDER BY avg_sal DESC

Answer 1

更有效地使用分析:

select employee_id, salary, department_id, avg_sal
from
(
  SELECT employee_id, salary, department_id, 
    round(avg(salary) over (partition by department_id), 2) avg_sal
  from emp
)
where salary > avg_sal
order by avg_sal desc