如何在MySQL中生成一系列每小时平均值? [英] How do I generate a series of hourly averages in MySQL?

问题描述

我的表中每隔十分钟就有一次数据:

I've got data in ten minutes intervals in my table:

2009-01-26 00:00:00      12
2009-01-26 00:10:00      1.1
2009-01-26 00:20:00      11
2009-01-26 00:30:00      0
2009-01-26 00:40:00      5
2009-01-26 00:50:00      3.4
2009-01-26 01:00:00      7
2009-01-26 01:10:00      7
2009-01-26 01:20:00      7.2
2009-01-26 01:30:00      3
2009-01-26 01:40:00      25
2009-01-26 01:50:00      4
2009-01-26 02:00:00      3
2009-01-26 02:10:00      4
etc.

是否可以为MySQL制定一个SQL查询，每小时返回一系列平均值?

Is it possible to formulate a single SQL-query for MySQL which will return a series of averages over each hour?

在这种情况下，它应该返回:

In this case it should return:

5.42
8.87
etc.

推荐答案

目前尚不清楚是否要在几天内汇总平均值.

It's unclear whether you want the average to be aggregated over days or not.

如果您希望26号午夜与27号午夜的平均值不同，则可以这样修改Mabwi的查询:

If you want a different average for midnight on the 26th vs midnight on the 27th, then modify Mabwi's query thus:

SELECT AVG( value ) , thetime
FROM hourly_averages
GROUP BY DATE( thetime ), HOUR( thetime )

请注意GROUP BY子句中的其他DATE().没有这个，查询将把00:00到00:59的所有数据平均在一起，而不考虑发生的日期.

Note the additional DATE() in the GROUP BY clause. Without this, the query would average together all of the data from 00:00 to 00:59 without regard to the date on which it happened.

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