How to show count of records - mysql

Question

I have the following data
ReasonId Team Division Location
2 A L1
3 B D1 L2
2 A D2 L1
2 A D3 L3
I want to show the count grouped by the ReasonId for each team,division & location. There could be instances where division could be null.
I am trying something like this,
SELECT
COUNT(*) AS TotalRequests, Reason, team
FROM
reports
GROUP BY Reason , team
UNION SELECT
COUNT(*) AS TotalRequests, Reason, location
FROM
reports
GROUP BY Reason , location
UNION SELECT
COUNT(*) AS TotalRequests, Reason, division
FROM
reports
WHERE
ISNULL(division) = 0
GROUP BY Reason , division
;
The output I am getting for the above is,
TotalRequests Reason team
1 2
3 2 A
1 3 B
1 3 D1
1 2 D2
1 2 D3
2 2 L1
1 3 L2
1 2 L3
Is it possible to get an output that looks like this,
ReasonId Team TotalByTeam Location TotalByLocation Division TotalByDivision
2 A 3 L1 2 0
2 A 3 L3 1 D2 1
2 A 3 L3 1 D3 1
3 B 1 L2 1 D1 1
I am using mysql 8.0.17 Here's a sample schema and dbfiddle of same
CREATE TABLE `reports` (
`Reason` int(11) DEFAULT NULL,
`Team` text,
`Division` text,
`Location` text
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
INSERT INTO reports (Reason,Team,Division,Location) values (2, 'A',null,'L1');
INSERT INTO reports (Reason,Team,Division,Location) values (3, 'A','D1','L2');
INSERT INTO reports (Reason,Team,Division,Location) values (2, 'A','D2','L1');
INSERT INTO reports (Reason,Team,Division,Location) values (2, 'A','D3','L3');

Answer 1

You should use analytic functions COUNT(...) OVER (...) for this. They are available in MySQL since version 8.0.
select
reasonid,
team,
count(team) over (partition by team) as total_by_team,
location,
count(location) over (partition by location) as total_by_location,
division,
count(division) over (partition by division) as total_by_division
from reports;
Demo: https://dbfiddle.uk/?rdbms=mysql_8.0&fiddle=79891554331e8222041ec34eea3fc4ee

Answer 2

Try this below script-
Demo Here
SELECT A.ReasonId,
A.Team,
(SELECT COUNT(*) FROM your_table B WHERE B.ReasonId = A.ReasonId AND B.Team = A.Team) TotalByTeam,
A.Division,
(SELECT COUNT(*) FROM your_table B WHERE B.ReasonId = A.ReasonId AND B.Division = A.Division) TotalByDivision,
A.Location,
(SELECT COUNT(*) FROM your_table B WHERE B.ReasonId = A.ReasonId AND B.Location = A.Location) TotalByLocation
FROM your_table A