SELECT every employee that has a higher salary than the AVERAGE of his department

Question

I have only 1 table named EMPLOYEE on my database with the 3 following collumns:

Employee_Name, Employee_Salary, Department_ID

Answer 1

Try this also:

Select e.ename, e.sal, e.deptno
from (select e.*, avg(sal) over (partition by deptno) as avgsalary
      from EMP_TABLE e
     ) e
where e.sal > e.avgsalary;