hello winston,
by your data,
select dep_id, ename, salary, count(*) over (partition by dep_id) from employee where salary<3000 order by dep_id ;
dep_id | ename | salary | count
--------+-------------------+--------+-------
30 | Shelli Baida | 2900 | 4
30 | Sigal Tobias | 2800 | 4
30 | Guy Himuro | 2600 | 4
30 | Karen Colmenares | 2500 | 4
50 | Michael Rogers | 2900 | 20
50 | Timothy Gates | 2900 | 20
50 | Vance Jones | 2800 | 20
50 | Mozhe Atkinson | 2800 | 20
50 | Girard Geoni | 2800 | 20
50 | John Seo | 2700 | 20
50 | Irene Mikkilineni | 2700 | 20
50 | Douglas Grant | 2600 | 20
50 | Randall Matos | 2600 | 20
50 | Donald OConnell | 2600 | 20
50 | Joshua Patel | 2500 | 20
50 | Peter Vargas | 2500 | 20
50 | Martha Sullivan | 2500 | 20
50 | James Marlow | 2500 | 20
50 | Randall Perkins | 2500 | 20
50 | James Landry | 2400 | 20
50 | Ki Gee | 2400 | 20
50 | Hazel Philtanker | 2200 | 20
50 | Steven Markle | 2200 | 20
50 | TJ Olson | 2100 | 20
2017-05-05 11:31 GMT+08:00 winston cheung <winston_cheung@xxxxxxx>:
hello
When I used the count in the window function, I found that the results were not true. In the table I use department_id as a partition condition, I think when department_id = 30, the calculation of salary <3000 should be 4, when department_id = 50,the calculation of salary < 3000 should be 20, why the value of each line are different?
Thanks a lot!
postgres@160.40:5410/testdb=# select department_id as dep_id, concat(first_name, ' ', last_name) as employee_name, salary, count(*) over w from employees where salary<3000 window w as (partition by department_id order by salary desc);
dep_id | employee_name | salary | count
--------+-------------------+---------+-------
30 | Shelli Baida | 2900.00 | 1
30 | Sigal Tobias | 2800.00 | 2
30 | Guy Himuro | 2600.00 | 3
30 | Karen Colmenares | 2500.00 | 4
50 | Michael Rogers | 2900.00 | 2
50 | Timothy Gates | 2900.00 | 2
50 | Vance Jones | 2800.00 | 5
50 | Mozhe Atkinson | 2800.00 | 5
50 | Girard Geoni | 2800.00 | 5
50 | John Seo | 2700.00 | 7
50 | Irene Mikkilineni | 2700.00 | 7
50 | Douglas Grant | 2600.00 | 10
50 | Randall Matos | 2600.00 | 10
50 | Donald OConnell | 2600.00 | 10
50 | Joshua Patel | 2500.00 | 15
50 | Peter Vargas | 2500.00 | 15
50 | Martha Sullivan | 2500.00 | 15
50 | James Marlow | 2500.00 | 15
50 | Randall Perkins | 2500.00 | 15
50 | James Landry | 2400.00 | 17
50 | Ki Gee | 2400.00 | 17
50 | Hazel Philtanker | 2200.00 | 19
50 | Steven Markle | 2200.00 | 19
50 | TJ Olson | 2100.00 | 20
(24 rows)
winston , regards
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