如何在MySQL中平均日期? [英] How can I make an average of dates in MySQL?

问题描述

如何在MySQL中计算日期之间的平均值? 我对时间值，小时和分钟更感兴趣.

How can I make an average between dates in MySQL? I am more interested in the time values, hours and minutes.

在具有以下内容的桌子上

On a table with:

| date_one   | datetime |
| date_two   | datetime |

进行如下查询:

 SELECT AVG(date_one-date_two) FROM some_table WHERE some-restriction-applies;

---

AVG(date1-date2)可以工作，但是我不知道它正在返回什么数据.

---

The AVG(date1-date2) works but I have no clue what data it is returning.

推荐答案

这似乎有些骇人听闻，但它适用于1970年〜1970年和2030年之间的日期(在32位拱上).您实际上是将日期时间值转换为整数，对其求平均，然后将平均值转换回日期时间值.

This seems a bit hackish, but will work for dates beteen ~ 1970 and 2030 (on 32 bit arch). You are essentially converting the datetime values to integer, averaging them, and converting the average back to a datetime value.

SELECT
    from_unixtime(
        avg(
            unix_timestamp(date_one)-unix_timestamp(date_two)
        )
    )
FROM
    some_table
WHERE
    some-restriction-applies

那里可能有更好的解决方案，但这将使您处于紧要关头.

There is likely a better solution out there, but this will get you by in a pinch.

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