How to implement group by range in postgresql
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Set up a test table
Testdb=# CREATE TEMP TABLE team (
Id serial
Name text
Birth_year integer
Salary integer
);
Insert record
Testdb=# INSERT INTO team (name, birth_year, salary)
VALUES ('Gabriel', 1970, 44000)
('Tom', 1972, 36000)
('Bill', 1978, 39500)
('Bob', 1980, 29000)
('Roger', 1976, 26800)
('Lucas', 1965, 56900)
('Jerome', 1984, 33500)
('Andrew', 1992, 41600)
('John', 1991, 40000)
('Paul', 1964, 39400)
('Richard', 1986, 23000)
('Joseph', 1988, 87000)
('Jason', 1990, 55000)
Query result
Testdb=# WITH series AS (
SELECT generate_series (1950, 2000, 10) AS time_start-- 1950 = min, 2010 = max, 10 = 10 year interval
), range AS (
SELECT time_start, (time_start + 9) AS time_end FROM series-- 9 = interval (10 years) minus 1
)
SELECT time_start, time_end
(SELECT count (*) FROM team WHERE birth_year BETWEEN time_start AND time_end) as team_members
Round ((SELECT AVG (salary) FROM team WHERE birth_year BETWEEN time_start AND time_end), 2) as salary_avg
(SELECT MIN (salary) FROM team WHERE birth_year BETWEEN time_start AND time_end) as salary_min
(SELECT MAX (salary) FROM team WHERE birth_year BETWEEN time_start AND time_end) as salary_max
FROM range
Output result:
Time_start | time_end | team_members | salary_avg | salary_min | salary_max
-+-
1950 | 1959 | 0 |
1960 | 1969 | 2 | 48150.00 | 39400 | 56900
1970 | 1979 | 4 | 36575.00 | 26800 | 44000
1980 | 1989 | 4 | 43125.00 | 23000 | 87000
1990 | 1999 | 3 | 45533.33 | 40000 | 55000
2000 | 2009 | 0 |
(6 rows)
Testdb=#
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