How to find cumulative sum between two dates in MySQL? - mysql

Question

How to find cumulative sum between two dates taking into account the previous state?
Putting WHERE condition
WHERE date BETWEEN '2021-02-19 12:00:00'AND '2021-02-21 12:00:00';
doesn't do the job because the sum starts from the first condition's date, and not from the first record. I would like to select only part of the whole query (between two dates), but to calculate cumulative sum from the first (initial) state.
I prepared Fiddle
CREATE TABLE `table1` (
`id` int(11) NOT NULL,
`date` datetime NOT NULL DEFAULT current_timestamp(),
`payment` double NOT NULL
);
INSERT INTO `table1` (`id`, `date`, `payment`) VALUES
(1, '2021-02-16 12:00:00', 100),
(2, '2021-02-17 12:00:00', 200),
(3, '2021-02-18 12:00:00', 300),
(4, '2021-02-19 12:00:00', 400),
(5, '2021-02-20 12:00:00', 500),
(6, '2021-02-21 12:00:00', 600),
(7, '2021-02-22 12:00:00', 700);
version();
SELECT DATE_FORMAT(date, "%Y-%m-%d") AS date,
payment, SUM(payment) OVER(ORDER BY id) AS balance
FROM table1
WHERE date BETWEEN '2021-02-19 12:00:00'AND '2021-02-21 12:00:00';

Answer 1

You must filter the table after you get the cumulative sums:
SELECT *
FROM (
SELECT DATE(date) AS date,
payment,
SUM(payment) OVER(ORDER BY id) AS balance
FROM table1
) t
WHERE date BETWEEN '2021-02-19'AND '2021-02-21';
or:
SELECT *
FROM (
SELECT DATE(date) AS date,
payment,
SUM(payment) OVER(ORDER BY id) AS balance
FROM table1
WHERE DATE(date) <= '2021-02-21'
) t
WHERE date >= '2021-02-19';
See the demo.
Results:
date
payment
balance
2021-02-19
400
1000
2021-02-20
500
1500
2021-02-21
600
2100