Is there possible query to compute for the total profits per category in 2 table? - mariadb

Question

How do I do.
Here is the table 1 for payments
Payments
paymentid
Unit
branch
tenantid
name
amount
note
dateofpayment
1
Bodega
Santo
1
Alsace Alsace
10000
REFRESHED DATA
2022-12-27 16:22:53
2
Bodega
Santo
1
Alsace Alsace
1333
wawdad
2022-11-22 19:17:45
3
Bodega
Jacinto MRT
1
Alsace Alsace
1000
dwadawdaw
2023-01-01 19:36:13
4
Bodega
Jacinto MRT
4
awd awdawd
2000
awd
2022-12-25 15:45:49
Here is the table 2 for expenses
Expenses
expensesid
branch
typeofexpenses
amount
note
dateofexpenses
2
Santo
Electricity
299
aadadad
2022-12-27 00:00:00
3
Maligno
Electricity
20
daawd
2022-12-27 00:00:00
4
Santo
Electricity
11111
adawd
2022-12-27 00:00:00
5
Santo
Electricity
30
ef
2022-12-27 00:00:00
7
Santo
Electricity
100
we
2023-01-17 19:56:26
8
Santo
Electricity
200
dw
2022-12-25 15:45:49
and I want to get the total profit of this table per branch
here is the query I use:
SELECT payments.branch , SUM(payments.amount) AS Profits, SUM(expenses.amount) AS Expenses, SUM(payments.amount) - SUM(expenses.amount) AS Total
FROM payments
RIGHT OUTER JOIN expenses
on payments.branch = expenses.branch
GROUP BY payments.branch
I tried the above query but there result is like this:
Expected result
Branch
Payments
Expenses
Profit
Santo
11333
11740
-407
Jacinto MRT
3000
0
3000
Maligno
0
20
-20
IF YOU WANT TO TRY IT ON YOUR MACHINE HERE IS THE QUERY
CREATE TABLE `expenses` (
`expensesid` int(255) NOT NULL,
`branch` varchar(255) NOT NULL,
`typeofexpenses` varchar(255) NOT NULL,
`amount` int(255) NOT NULL,
`note` varchar(255) NOT NULL,
`dateofexpenses` datetime NOT NULL
);
INSERT INTO `expenses` (`expensesid`, `branch`, `typeofexpenses`, `amount`, `note`, `dateofexpenses`) VALUES
(2, 'Santo', 'Electricity', 299, 'aadadad', '2022-12-27 00:00:00'),
(3, 'Maligno', 'Electricity', 20, 'daawd', '2022-12-27 00:00:00'),
(4, 'Santo', 'Electricity', 11111, 'adawd', '2022-12-27 00:00:00'),
(5, 'Santo', 'Electricity', 30, 'ef', '2022-12-27 00:00:00'),
(7, 'Santo', 'Electricity', 100, 'we', '2023-01-17 19:56:26'),
(8, 'Santo', 'Electricity', 200, 'dw', '2022-12-25 15:45:49');
CREATE TABLE `payments` (
`paymentid` int(11) NOT NULL,
`Unit` varchar(255) NOT NULL,
`branch` varchar(255) NOT NULL,
`tenantid` int(11) NOT NULL,
`name` varchar(255) NOT NULL,
`amount` int(11) NOT NULL,
`note` varchar(255) NOT NULL,
`dateofpayment` datetime NOT NULL
);
INSERT INTO `payments` (`paymentid`, `Unit`, `branch`, `tenantid`, `name`, `amount`, `note`, `dateofpayment`) VALUES
(1, 'Bodega', 'Santo', 1, 'Alsace Alsace', 10000, 'REFRESHED DATA', '2022-12-27 16:22:53'),
(2, 'Bodega', 'Santo', 1, 'Alsace Alsace', 1333, 'wawdad', '2022-11-22 19:17:45'),
(3, 'Bodega', 'Jacinto MRT', 1, 'Alsace Alsace', 1000, 'dwadawdaw', '2023-01-01 19:36:13'),
(4, 'Bodega', 'Jacinto MRT', 4, 'awd awdawd', 2000, 'awd', '2022-12-25 15:45:49');

Answer 1

One way of doing this is to start with the full list of branches (subquery b) and then left join to the aggregated data of the other two tables (sub queries p & e) -
SELECT
b.branch AS Branch,
IFNULL(p.amount, 0) AS Payments,
IFNULL(e.amount, 0) AS Expenses,
IFNULL(p.amount, 0) - IFNULL(e.amount, 0) AS Profit
FROM (SELECT DISTINCT branch FROM expenses UNION SELECT DISTINCT branch FROM payments) AS b
LEFT JOIN (SELECT branch, SUM(amount) amount FROM payments GROUP BY branch) AS p ON b.branch = p.branch
LEFT JOIN (SELECT branch, SUM(amount) amount FROM expenses GROUP BY branch) AS e ON b.branch = e.branch;
As you are using MariaDB >= 10.2.1 we can use Common Table Expressions to improve readability. And as you have stated that you have a separate table for branches, I will assume branches (branchid, name) and branchid instead of branch in expenses and payments tables.
WITH payments AS (
SELECT branchid, SUM(amount) total FROM payments GROUP BY branchid
), expenses AS (
SELECT branchid, SUM(amount) total FROM expenses GROUP BY branchid
)
SELECT
b.name AS Branch,
IFNULL(p.total, 0) AS Payments,
IFNULL(e.total, 0) AS Expenses,
IFNULL(p.total, 0) - IFNULL(e.total, 0) AS Profit
FROM branches AS b
LEFT JOIN payments AS p ON b.branchid = p.branchid
LEFT JOIN expenses AS e ON b.branchid = e.branchid;