还有另一种解决方案
SELECT r1.date, r1.time_spent, sum(r2.time_spent) AS rolling_week_total
FROM rolling_total AS r1 JOIN rolling_total AS r2
ON datediff(r1.date, r2.date) BETWEEN 0 AND 7
GROUP BY r1.date
ORDER BY r1.date
LIMIT 8
在一段时间内在mysql中创建一个ROLLING总和
在一段时间内在mysql中创建一个ROLLING总和
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