[英]Group By month with sum value and rolling year
我正在尝试在MySQL中按月对销售数据进行分组,但要具有滚动的年份总和值。 预期输出示例:
Month SUM
January 2018 Total from february 2017 to january 2018 (12months)
February 2018 Total from march 2017 to february 2018 (12months)
...
这是我到目前为止所得到的:
SELECT YEAR(date), MONTH(date),
(SELECT SUM(quantity) FROM tb t2 WHERE t2.date BETWEEN DATE_SUB(t1.date, INTERVAL 1 YEAR) AND t1.date)
FROM tb t1
WHERE date BETWEEN '2018-01-01' AND '2019-01-01'
GROUP BY YEAR(date), MONTH(date)
结果是预期的,但是效率很低,因为如果我使用3天的间隔,则需要30秒才能运行(因此,我甚至无法以1年的间隔运行)
任何想法如何改善此查询,以便我可以使用1年的时间间隔? 在特定字段上是否需要索引?
编辑 :创建语句:
CREATE TABLE IF NOT EXISTS `tb` (
`inc` int(11) NOT NULL AUTO_INCREMENT,
`quantity` float NOT NULL,
`date` datetime NOT NULL,
PRIMARY KEY (`inc`),
KEY `date` (`date`)
) ENGINE=InnoDB;
它有超过10万行,我无法升级到MySQL> = 8
代替使用子查询,“自我加入”可以更有效。 请尝试以下操作:
SELECT
YEAR(t1.date),
MONTH(t1.date),
SUM(t2.quantity)
FROM tb AS t1
JOIN tb AS t2
ON t2.date BETWEEN (t1.date - INTERVAL 1 YEAR) AND t1.date
WHERE t1.date BETWEEN '2018-01-01' AND '2019-01-01'
GROUP BY YEAR(t1.date), MONTH(t1.date)
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