Write a query in SQL to list the name,salary, and department id for each employee who earns a salary greater than the average salary for their department and list the result in ascending order on department id

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Write a query in SQL to list the name,salary, and department id for each employee who earns a salary greater than the average salary for their department and list the result in ascending order on department id.

 

Sample table: employees

 emp_id | emp_name | job_name  | manager_id | hire_date  | salary  | commission | dep_id
--------+----------+-----------+------------+------------+---------+------------+--------
  68319 | KAYLING  | PRESIDENT |            | 1991-11-18 | 6000.00 |            |   1001
  66928 | BLAZE    | MANAGER   |      68319 | 1991-05-01 | 2750.00 |            |   3001
  67832 | CLARE    | MANAGER   |      68319 | 1991-06-09 | 2550.00 |            |   1001
  65646 | JONAS    | MANAGER   |      68319 | 1991-04-02 | 2957.00 |            |   2001
  67858 | SCARLET  | ANALYST   |      65646 | 1997-04-19 | 3100.00 |            |   2001
  69062 | FRANK    | ANALYST   |      65646 | 1991-12-03 | 3100.00 |            |   2001
  63679 | SANDRINE | CLERK     |      69062 | 1990-12-18 |  900.00 |            |   2001
  64989 | ADELYN   | SALESMAN  |      66928 | 1991-02-20 | 1700.00 |     400.00 |   3001
  65271 | WADE     | SALESMAN  |      66928 | 1991-02-22 | 1350.00 |     600.00 |   3001
  66564 | MADDEN   | SALESMAN  |      66928 | 1991-09-28 | 1350.00 |    1500.00 |   3001
  68454 | TUCKER   | SALESMAN  |      66928 | 1991-09-08 | 1600.00 |       0.00 |   3001
  68736 | ADNRES   | CLERK     |      67858 | 1997-05-23 | 1200.00 |            |   2001
  69000 | JULIUS   | CLERK     |      66928 | 1991-12-03 | 1050.00 |            |   3001
  69324 | MARKER   | CLERK     |      67832 | 1992-01-23 | 1400.00 |            |   1001
(14 rows)

الأجوبة

SELECT e.emp_name,
       e.salary,
       e.dep_id
FROM employees e,

  (SELECT avg(salary) A,
          dep_id D
   FROM employees
   GROUP BY dep_id) D1
WHERE D1.D = e.dep_id
  AND e.salary > D1.A;

Sample Output:

 emp_name | salary  | dep_id
----------+---------+--------
 KAYLING  | 6000.00 |   1001
 JONAS    | 2957.00 |   2001
 SCARLET  | 3100.00 |   2001
 FRANK    | 3100.00 |   2001
 BLAZE    | 2750.00 |   3001
 ADELYN   | 1700.00 |   3001
(6 rows)
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