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HomeDatabaseMysql TutorialMysql 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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