我有这张桌子:
`Telegramas` (`Id`, `Fecha`, `Valor_Dispositivo`) VALUES
(1, '2017-12-14 11:06:01.6976', '5'),
(2, '2017-12-14 11:07:01.4561', '2'),
(3, '2017-12-14 11:08:01.1651', '6'),
(4, '2017-12-14 12:06:01.2146', '1'),
(5, '2017-12-14 12:40:01.7981', '9');
我需要这样的退出:
2017-12-14 11:00:00.0000 -> 4.33
2017-12-14 12:00:00.0000 -> 5
我需要每小时按日期列计算时间间隔来计算数据的平均值。
这是我的查询,我很丢失。我需要帮助。
SELECT TIME(DATE_SUB(Telegramas.Fecha,INTERVAL (MINUTE(Telegramas.Fecha)%20) MINUTE)) as tiempo, SUM(IFNULL(Telegramas.Valor_Dispositivo,0)) as suma FROM Telegramas GROUP BY Fecha ORDER BY Telegramas.ID_Auto DESC;
答案 0 :(得分:2)
一种方法是从date
中提取hour
和timestamp
部分,然后按结果分组。
select DATE_ADD(date(fecha), INTERVAL EXTRACT(HOUR FROM fecha) HOUR) as FECHA_DATE_HOUR,
avg(Valor_Dispositivo) as Valor_Dispositivo
from Telegramas
group by date(fecha), EXTRACT(HOUR FROM fecha);
<强>结果:强>
+---------------------+-------------------+
| FECHA_DATE_HOUR | Valor_Dispositivo |
+---------------------+-------------------+
| 14.12.2017 11:00:00 | 4.3333 |
| 14.12.2017 12:00:00 | 5.0000 |
+---------------------+-------------------+
<强> DEMO 强>
答案 1 :(得分:1)
我会利用函数DATE_FORMAT并转换类型datetime:
DATE_FORMAT(CURRENT_TIMESTAMP, '%Y-%m-%d %H:00:00');
在你的例子中:
SELECT AVG(`Valor_Dispositivo`), DATE_FORMAT(`Fecha`, '%Y-%m-%d %H:00:00') `by_hour`
FROM `Telegramas`
GROUP BY 2;
答案 2 :(得分:1)
试试这个:一种简单的方法可以帮到你
SELECT CONCAT(DATE(Fecha), ' ', HOUR(Fecha),':00:00.0000') Fecha,
AVG(valor_Dispositivo) average
FROM Telegramas
GROUP BY DATE(Fecha), HOUR(Fecha)