Oracle show all employees with greater than average salary of their department

Question

I am writing a query to find employees who earn greater than the average salary within their department. I need to display the employee ID, salary, department id, and averag

Answer 1

More efficient to use analytics:

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