Question

在这里，我已经取消了2007年第一天的天然气消耗量。时间以UTC为单位，因此当天从早上5点开始运行24小时。

select sum(b.kwh) as consumption
from BATimeSeries b
where 
    b.companyNo = 1 and 
    b.DayTime >= '2007-01-01 05:00:00.000' and 
    b.DayTime < '2007-01-02 05:00:00.000'

这里它只给出了一个单行（消耗）的表格，它给出了当天的耗电量（以kWh为单位）。但我真的希望有一个跨越一段时间的表，例如一周，一个月或一年。每行有两列：day，consumption，列出区间中的每一天以及该特定日期的消耗总和。我无法想出会在几天内汇总，然后在这几天中每天汇总一天。任何帮助表示赞赏。

Answer 1

一个简单的GROUP BY就足够了;

SELECT DAY(daytime - INTERVAL 5 HOUR) day, SUM(b.kwh) consumption
FROM BATimeSeries b
WHERE b.companyNo = 1
GROUP BY day;

An SQLfiddle to test with

Answer 2

这样的东西？

SELECT DATE(b.DayTime),sum(b.kwh) as consumption
FROM BATimeSeries b
WHERE
    b.companyNo = 1 and 
    b.DayTime >= '2007-01-01 05:00:00.000' and 
    b.DayTime < '2007-01-02 05:00:00.000'
GROUP BY DATE(b.DayTime)

如果你删除了那里，你应该从所有日子开始。

SELECT DATE(b.DayTime),sum(b.kwh) as consumption
FROM BATimeSeries b
WHERE b.companyNo = 1 and 
GROUP BY DATE(b.DayTime)

个别日子的总和

2 个答案: