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Mysql 按月份为组进行统计排序_MySQL

在数据库中我们经常用sql语句对表进行简单的统计排序，对于日期字段，我们可以简单的对其进行order。对于复杂一点的可以按日期中的年，月，日分别进行group，order。

按年份进行group，统计排序：

SELECT YERA(established_time),COUNT(*) AS num FROM `table_record` GROUP BY YEAR (established_time)

按月份进行group，统计排序：

方法一：简单实用

SELECT YEAR(established_time) AS 'year' , MONTH(established_time) AS 'month' , COUNT(*) AS 'count' FROM <span style="font-family: Arial, Helvetica, sans-serif;">`table_record` </span><pre name="code" class="sql"><span style="font-family: Arial, Helvetica, sans-serif;">GROUP BY YEAR (established_time) DESC, MONTH(established_time)</span>

效果：

year month count

------ ------ --------

2014 1 8320

2014 2 5837

2014 3 25069

2014 4 29910

2014 5 25018

2014 6 17347

2014 7 1

2013 1 9114

2013 2 4258

方法二：利用MySql内置字符串连接函数 CONCAT(str1, str2, ...,str3) 。

SELECTCONCAT(YEAR(established_time),',',MONTH( established_time)) AS data_time ,COUNT(*) AS num FROM `table_record` #group by data_timeGROUP BY YEAR(established_time) DESC,MONTH( established_time)

效果：

data_time num

--------- --------

2014,1 8320

2014,2 5837

2014,3 25069

2014,4 29910

2014,5 25018

2014,6 17347

2014,7 1

2013,1 9114

2013,2 4258

注意这里不要用：

<span style="font-family:Microsoft YaHei UI, Microsoft YaHei, SimSun, Segoe UI, Tahoma, Helvetica, sans-serif, Microsoft YaHei, Georgia, Helvetica, Arial, sans-serif, 宋体, PMingLiU, serif;">SELECTYEAR(established_time)+MONTH( established_time) as data_time </span>

这是错误的，它会造成2010+1=2011的这样的错误。

此外，若仅仅用下面语句，是统计的是多年来每月的数据。

<span style="font-family:Microsoft YaHei UI, Microsoft YaHei, SimSun, Segoe UI, Tahoma, Helvetica, sans-serif, Microsoft YaHei, Georgia, Helvetica, Arial, sans-serif, 宋体, PMingLiU, serif;">SELECTMONTH(established_time) AS 'month' , COUNT(*) AS 'count' FROM `tb_gongshangju_record_beijing` GROUP BYMONTH(established_time) DESC</span>


效果如下：

month count

------ --------

12 44952

11 49720

10 38587

9 48967

8 52874

7 54082

6 69532

5 76999

4 87289

3 85249

2 39997

1 49017

按日期day进行group，统计排序

<span style="font-family:Microsoft YaHei UI, Microsoft YaHei, SimSun, Segoe UI, Tahoma, Helvetica, sans-serif, Microsoft YaHei, Georgia, Helvetica, Arial, sans-serif, 宋体, PMingLiU, serif;">SELECT YEAR(established_time) AS 'year' , MONTH(established_time) AS 'month' ,DAY(established_time) AS 'day', COUNT(*) AS 'count' FROM `table_record` WHERE table_record.`established_time` >= '2014-01-01'GROUP BY YEAR (established_time) DESC, MONTH(established_time) DESC ,DAY(established_time) DESC</span>
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