Php 如何计算两个日期之间的小时、日、月和年平均值？

我正在用PHP开发一个应用程序。我使用MySql数据库来实现这一点。我想计算两个日期之间的平均

我对小时平均值的查询是

SELECT avg(value) 
FROM table_name  
WHERE (added_date BETWEEN '2014-01-29 00:00:00' AND '2014-01-31 00:00:00') 
GROUP BY DATE(added_date), HOUR(added_date)  
ORDER BY added_date ASC

现在我想对CalculateDaily、monthly和YearalAverage执行相同的查询。

---

请提出解决方案。谢谢你是说像这样的东西吗

小时平均

SELECT DATE(added_date), HOUR(added_date) , avg(value) 
FROM table_name  
WHERE (added_date BETWEEN '2013-01-29 00:00:00' AND '2014-01-31 00:00:00') 
GROUP BY DATE(added_date), HOUR(added_date)  
ORDER BY added_date ASC

SELECT DATE(added_date) , avg(value) 
FROM table_name  
WHERE (added_date BETWEEN '2013-01-29 00:00:00' AND '2014-01-31 00:00:00') 
GROUP BY DATE(added_date)
ORDER BY added_date ASC

SELECT YEAR(added_date), MONTH(added_date), avg(value) 
FROM table_name  
WHERE (added_date BETWEEN '2013-01-29 00:00:00' AND '2014-01-31 00:00:00') 
GROUP BY YEAR(added_date), MONTH(added_date)
ORDER BY added_date ASC

SELECT YEAR(added_date), avg(value) 
FROM table_name  
WHERE (added_date BETWEEN '2013-01-29 00:00:00' AND '2014-01-31 00:00:00') 
GROUP BY YEAR(added_date)  
ORDER BY added_date ASC

日均

SELECT DATE(added_date), HOUR(added_date) , avg(value) 
FROM table_name  
WHERE (added_date BETWEEN '2013-01-29 00:00:00' AND '2014-01-31 00:00:00') 
GROUP BY DATE(added_date), HOUR(added_date)  
ORDER BY added_date ASC

SELECT DATE(added_date) , avg(value) 
FROM table_name  
WHERE (added_date BETWEEN '2013-01-29 00:00:00' AND '2014-01-31 00:00:00') 
GROUP BY DATE(added_date)
ORDER BY added_date ASC

SELECT YEAR(added_date), MONTH(added_date), avg(value) 
FROM table_name  
WHERE (added_date BETWEEN '2013-01-29 00:00:00' AND '2014-01-31 00:00:00') 
GROUP BY YEAR(added_date), MONTH(added_date)
ORDER BY added_date ASC

SELECT YEAR(added_date), avg(value) 
FROM table_name  
WHERE (added_date BETWEEN '2013-01-29 00:00:00' AND '2014-01-31 00:00:00') 
GROUP BY YEAR(added_date)  
ORDER BY added_date ASC

月平均

SELECT DATE(added_date), HOUR(added_date) , avg(value) 
FROM table_name  
WHERE (added_date BETWEEN '2013-01-29 00:00:00' AND '2014-01-31 00:00:00') 
GROUP BY DATE(added_date), HOUR(added_date)  
ORDER BY added_date ASC

SELECT DATE(added_date) , avg(value) 
FROM table_name  
WHERE (added_date BETWEEN '2013-01-29 00:00:00' AND '2014-01-31 00:00:00') 
GROUP BY DATE(added_date)
ORDER BY added_date ASC

SELECT YEAR(added_date), MONTH(added_date), avg(value) 
FROM table_name  
WHERE (added_date BETWEEN '2013-01-29 00:00:00' AND '2014-01-31 00:00:00') 
GROUP BY YEAR(added_date), MONTH(added_date)
ORDER BY added_date ASC

SELECT YEAR(added_date), avg(value) 
FROM table_name  
WHERE (added_date BETWEEN '2013-01-29 00:00:00' AND '2014-01-31 00:00:00') 
GROUP BY YEAR(added_date)  
ORDER BY added_date ASC

年平均

SELECT DATE(added_date), HOUR(added_date) , avg(value) 
FROM table_name  
WHERE (added_date BETWEEN '2013-01-29 00:00:00' AND '2014-01-31 00:00:00') 
GROUP BY DATE(added_date), HOUR(added_date)  
ORDER BY added_date ASC

SELECT DATE(added_date) , avg(value) 
FROM table_name  
WHERE (added_date BETWEEN '2013-01-29 00:00:00' AND '2014-01-31 00:00:00') 
GROUP BY DATE(added_date)
ORDER BY added_date ASC

SELECT YEAR(added_date), MONTH(added_date), avg(value) 
FROM table_name  
WHERE (added_date BETWEEN '2013-01-29 00:00:00' AND '2014-01-31 00:00:00') 
GROUP BY YEAR(added_date), MONTH(added_date)
ORDER BY added_date ASC

SELECT YEAR(added_date), avg(value) 
FROM table_name  
WHERE (added_date BETWEEN '2013-01-29 00:00:00' AND '2014-01-31 00:00:00') 
GROUP BY YEAR(added_date)  
ORDER BY added_date ASC

---

哦，考虑提供适当的DDL（和/或AM SqLFIDLE）以及期望的结果集。