按日期和时间划分的MySql查询组
我正在尝试创建SQL查询以解决问题。按日期和时间划分的MySql查询组,mysql,sql,Mysql,Sql,我正在尝试创建SQL查询以解决问题。 我的桌子: +----+---------------------+-------+ | id | date | value | +----+---------------------+-------+ | 1 | 2014-10-10 05:10:10 | 10 | +----+---------------------+-------+ | 2 | 2014-10-10 09:10:10 | 20 | +--
我的桌子:
+----+---------------------+-------+
| id | date | value |
+----+---------------------+-------+
| 1 | 2014-10-10 05:10:10 | 10 |
+----+---------------------+-------+
| 2 | 2014-10-10 09:10:10 | 20 |
+----+---------------------+-------+
| 3 | 2014-10-10 15:10:10 | 30 |
+----+---------------------+-------+
| 4 | 2014-10-10 23:10:10 | 40 |
+----+---------------------+-------+
| 5 | 2014-10-11 08:10:10 | 15 |
+----+---------------------+-------+
| 6 | 2014-10-11 09:10:10 | 25 |
+----+---------------------+-------+
| 7 | 2014-10-11 10:10:10 | 30 |
+----+---------------------+-------+
| 8 | 2014-10-11 23:10:10 | 40 |
+----+---------------------+-------+
我想按天分组求和,这一天分为三个子组,如“上午”(06:00-12:00)、“下午”(12:00-18:00)和“晚上”(00:00-06:00和18:00-24:00)类似这样的内容:
+------------+-------+---------+-----------+-------+
| date | value | morning | afternoon | night |
+------------+-------+---------+-----------+-------+
| 2014-10-10 | 100 | 20 | 30 | 50 |
+------------+-------+---------+-----------+-------+
| 2014-10-11 | 110 | 70 | 0 | 40 |
+------------+-------+---------+-----------+-------+
您可以在
case
表达式上使用两个sum
s:
SELECT DAY(`date`) AS `date`
SUM(CASE WHEN HOUR(`date`) BETWEEN 6 AND 12 THEN value ELSE 0 END) AS `morning`,
SUM(CASE WHEN HOUR(`date`) BETWEEN 12 AND 18 THEN value ELSE 0 END) AS `afternoon`,
SUM(CASE WHEN HOUR(`date`) < 6 OR HOUR(`date`) > 18 THEN value ELSE 0 END) AS `evening`
FROM my_table
GROUP BY DAY(`date`)
选择日期(`date`)作为`date``
求和(当小时(`date`)介于6和12之间时,则值为0结束)为`morning`,
求和(当小时(`date`)介于12和18之间时,则值为0结束)为`午后`,
求和(当小时(`date`)<6或小时(`date`)>18时,则值为0结束)为晚上`
从我的桌子上
按天分组(`date`)
有多种方法可以做到这一点,但对于我自己来说,我会先在交叉应用程序中提取伪信息,然后根据这些信息进行分组
我相信这提供了显著的可读性优势,并允许您重用其他条款中的任何计算。例如,您已将分组机制集中化,这意味着您只需要在一个位置更改它,而不需要在select和group by中更改它。类似地,您可以将“extraData.Morning=1”添加到WHERE子句中,而不是重新编写早晨的计算
例如:
CREATE TABLE #TestData (ID INT, Data DATETIME, Value INT)
INSERT INTO #TestData (ID, Data, Value) VALUES
(1 ,'2014-10-10 05:10:10' ,10)
,(2 ,'2014-10-10 09:10:10' ,20)
,(3 ,'2014-10-10 15:10:10' ,30)
,(4 ,'2014-10-10 23:10:10' ,40)
,(5 ,'2014-10-11 08:10:10' ,15)
,(6 ,'2014-10-11 09:10:10' ,25)
,(7 ,'2014-10-11 10:10:10' ,30)
,(8 ,'2014-10-11 23:10:10' ,40)
SELECT
extraData.DayComponent
,SUM(td.Value)
,SUM(CASE WHEN extraData.Morning = 1 THEN td.Value ELSE 0 END) AS Morning
,SUM(CASE WHEN extraData.Afternoon = 1 THEN td.Value ELSE 0 END) AS Afternoon
,SUM(CASE WHEN extraData.Night = 1 THEN td.Value ELSE 0 END) AS Night
FROM #TestData td
CROSS APPLY (
SELECT
DATEADD(dd, 0, DATEDIFF(dd, 0, td.Data)) AS DayComponent
,CASE WHEN DATEPART(HOUR, td.Data) BETWEEN 6 AND 12 THEN 1 ELSE 0 END AS Morning
,CASE WHEN DATEPART(HOUR, td.Data) BETWEEN 12 AND 18 THEN 1 ELSE 0 END AS Afternoon
,CASE WHEN DATEPART(HOUR, td.Data) BETWEEN 0 AND 6
OR DATEPART(HOUR, td.Data) BETWEEN 18 AND 24 THEN 1 ELSE 0 END AS Night
) extraData
GROUP BY
extraData.DayComponent
DROP TABLE #TestData
交叉应用只是SQL Server,不是吗?啊,对不起,我没有注意到mySQL标记。应该从表格格式中得到提示。