如何在 MySQL 中获取当前日期到发布日期之间的平均点击次数？

Question

您好，有一个表名images

图片

id        hits       created
--------------------------------------
1         10       2014-11-07 11:07:57
2         8        2014-11-10 05:10:20
3         70       2014-10-04 08:04:22

在上表中，我想获得平均最高频率记录数。

Q. What is Frequency?
A. Frequency means number-of-hits/number-of-days(current date - created date)

N.B- 天你会得到当前日期减去创建日期。

示例：-假设我的点击是10，创建日期是2014-11-07 11:07:57，那么频率将为10/4=2.5 与8/1=8 和70/37=1.89 相同

我需要在单个 MySQL 查询中按频率降序获取所有记录。

谢谢 中国

Answer 1

使用DATEDIFF 函数。

查询

SELECT id,hits,created,
hits/(DATEDIFF(NOW(),created)) AS Frequency
FROM images
ORDER BY Frequency DESC;

输出

+----+------+---------------------------------+-----------+
| ID | HITS |         CREATED                 | FREQUENCY |
|----+------+---------------------------------+-----------+
|  2 |    8 | November, 10 2014 05:10:20+0000 |   8       |
|  1 |   10 | November, 07 2014 11:07:57+0000 |   2.5     |
|  3 |   70 |  October, 04 2014 08:04:22+0000 |   1.8421  |
+----+------+---------------------------------+-----------+

Demo

Answer 2

为了更精确地使用小时，您还可以使用TIMESTAMPDIFF

SELECT id,hits,created,
hits/((TIMESTAMPDIFF(HOUR,created,NOW()))/24) AS Frequency
FROM images
ORDER BY Frequency DESC;