我需要合并三个地方在单个查询

Question

条件，我需要合并三个查询ANS显示在一个表结构

SQL查询：

SELECT MonthName(created) as Month ,year(created) as Year ,user_type,count(user_type) 
    FROM `cii_registered_users` 
    WHERE verification=1 
    AND activation_step=5 
    AND status=1 
    AND user_type='1' 
    AND year(created)='2017' 
    AND created > CURDATE() - INTERVAL 3 MONTH 
    GROUP BY user_type,month(created),year(created) 

SELECT MonthName(created) as Month ,year(created) as Year ,user_type,count(user_type) 
    FROM `cii_registered_users` 
    WHERE verification=1 
    AND activation_step=5 
    AND status=1 
    AND user_type='2' 
    AND year(created)='2017' 
    AND created > CURDATE() - INTERVAL 3 MONTH 
    GROUP BY user_type,month(created),year(created) 

SELECT MonthName(created) as Month ,year(created) as Year ,user_type,count(user_type) 
    FROM `cii_registered_users` 
WHERE verification=1 
    AND activation_step=5 
    AND status=1 
    AND user_type='3' 
    AND year(created)='2017' 
    AND created > CURDATE() - INTERVAL 3 MONTH 
GROUP BY user_type,month(created),year(created) 

然后我需要单独一行显示用户类型和总计数除三个之外，间隔总数的种种罪状

Month  Year count(user_type=2)  count(user_type=1) full year count 
    June  2017  12      3 
    July  2017  1      17 
    August 2017  10      8 
    September 2017  1      1 

我需要的只是这个4个月

Answer 1

这似乎是一个旋转的作业另一列总数排序查询

尝试这样：

SELECT MONTH(created) as Month, 
     YEAR(created) as Year, 
     SUM(user_type = '1') user_type_1, 
     SUM(user_type = '2') user_type_2, 
     SUM(user_type = '3') user_type_3 
    FROM table 
    WHERE whatever 
    GROUP BY MONTH(created), YEAR(created) 

为什么这项工作？因为在MySQL中，像user_type = '1'这样的表达式的值为1，如果为true，则0为假。

为什么这是一个好方法？阅读和验证并不难，在需要时也不难改变。

如果这是我的查询，我会use LAST_DAY()而不是YEAR()和MONTH()，如下所示。但也许这只是个人偏好。

SELECT LAST_DAY(created) AS month_ending, 
      ... 
GROUP BY LAST_DAY(created)