MySQL: Running Total (Cumulative Sum)
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-- without using SET variable | |
SELECT t.id, | |
t.count, | |
(@running_total := @running_total + t.count) AS cumulative_sum | |
FROM TABLE t | |
JOIN (SELECT @running_total := 0) r | |
ORDER BY t.id | |
-- with SET variable | |
SET @running_total := 0; | |
SELECT | |
q1.d, | |
q1.c, | |
(@running_total := @running_total + q1.c) AS rt | |
FROM | |
(SELECT | |
DAYOFYEAR(`date`) AS d, | |
COUNT(*) AS c | |
FROM `orders` | |
WHERE `hasPaid` > 0 | |
GROUP BY d | |
ORDER BY d | |
) AS q1 |
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I am thinking that you may need to use window function when the running total is also in a subgroup.