Mysql時間段數(shù)分段據(jù)累加求和

簡介

時間段數(shù)據(jù)的分段可以根據(jù)義務(wù)邏輯來劃分，累加求和在mysql8.0及以上可以通過sum結(jié)合窗口函數(shù)來實現(xiàn)，低版本用子查詢實現(xiàn)。

需求

對原始數(shù)據(jù)按照時間點3點前、6點前、12點前對數(shù)值的累計得到如下結(jié)果：

時間段 累計
3 6
6 17
12 39

原始數(shù)據(jù)附錄如下：

id inserttime num

1 2020-07-30 00:00:00 1

2 2020-07-30 01:00:00 2

3 2020-07-30 02:00:00 3

4 2020-07-30 03:00:00 2

5 2020-07-30 04:00:00 3

6 2020-07-30 05:00:00 6

7 2020-07-30 06:00:00 1

8 2020-07-30 07:00:00 5

9 2020-07-30 08:00:00 7

10 2020-07-30 09:00:00 2

11 2020-07-30 10:00:00 4

12 2020-07-30 11:00:00 3

?解決方法

-- Ⅰ關(guān)于問題,如果是Mysql 8.0用sum結(jié)合窗口函數(shù)，Mysql5.7及以下用子查詢。-- Ⅱ詳細(xì)過程 Step By Step見代碼處 -- Step 1 初始化表及數(shù)據(jù) create table tb_shenliang2025( id int, inserttime datetime, num int ); INSERT INTO tb_shenliang2025SELECT 1 id,'2020-07-30 00:00:00' inserttime,'1' num UNION ALLSELECT 2 id,'2020-07-30 01:00:00' inserttime,'2' num UNION ALLSELECT 3 id,'2020-07-30 02:00:00' inserttime,'3' num UNION ALLSELECT 4 id,'2020-07-30 03:00:00' inserttime,'2' num UNION ALLSELECT 5 id,'2020-07-30 04:00:00' inserttime,'3' num UNION ALLSELECT 6 id,'2020-07-30 05:00:00' inserttime,'6' num UNION ALLSELECT 7 id,'2020-07-30 06:00:00' inserttime,'1' num UNION ALLSELECT 8 id,'2020-07-30 07:00:00' inserttime,'5' num UNION ALLSELECT 9 id,'2020-07-30 08:00:00' inserttime,'7' num UNION ALLSELECT 10 id,'2020-07-30 09:00:00' inserttime,'2' num UNION ALLSELECT 11 id,'2020-07-30 10:00:00' inserttime,'4' num UNION ALLSELECT 12 id,'2020-07-30 11:00:00' inserttime,'3' num-- Step 2 Mysql8.0及以上結(jié)合窗口函數(shù)編寫累計求和SQL SELECT DISTINCT "時間段",SUM(num)OVER(ORDER BY flag RANGE BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW) AS "累計"--SUM(num)OVER(ORDER BY flag) AS "累計" --默認(rèn)即上述參數(shù)FROM(SELECT CASE WHEN hour(inserttime)>=0 AND hour(inserttime)<3 THEN 3 WHEN hour(inserttime)>=3 AND hour(inserttime)<6 THEN 6ELSE 12 END flag,num FROM tb_shenliang2025 A)A-- Step 3 Mysql 5.7及以下版本(同樣適用于Mysql8.0) SELECT A.flag "時間段",(SELECT SUM(num) FROM (SELECT flag,SUM(num) num FROM(SELECT CASE WHEN hour(inserttime)>=0 AND hour(inserttime)<3 THEN 3 WHEN hour(inserttime)>=3 AND hour(inserttime)<6 THEN 6ELSE 12 END flag,num FROM tb_shenliang2025)AGROUP BY flag)BWHERE B.flag<=A.flag) "累計" FROM (SELECT flag,SUM(num) num FROM(SELECT CASE WHEN hour(inserttime)>=0 AND hour(inserttime)<3 THEN 3 WHEN hour(inserttime)>=3 AND hour(inserttime)<6 THEN 6ELSE 12 END flag,num FROM tb_shenliang2025)AGROUP BY flag)A-- Step 4 延展閱讀,如果Step3的代碼看上去麻煩,可以看如下簡略版 -- 該輔助解釋代碼僅適用于Mysql8.0,因CTE在mysql低版本不支持 WITH CTE AS( SELECT 1 id,6 num UNION ALL SELECT 2 id,11 num UNION ALL SELECT 3 id,22 num UNION ALL SELECT 4 id,19 num )SELECT A.id,(SELECT SUM(num) FROM CTE BWHERE B.id<=A.id) total FROM CTE A-- 這里的CTE相當(dāng)于Step3里按時間段分組統(tǒng)計。SELECT flag,SUM(num) num FROM(SELECT CASE WHEN hour(inserttime)>=0 AND hour(inserttime)<3 THEN 3 WHEN hour(inserttime)>=3 AND hour(inserttime)<6 THEN 6ELSE 12 END flag,num FROM tb_shenliang2025)AGROUP BY flag -- 執(zhí)行結(jié)果

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