MySQL：按查询统计分组中的总数

Question

我有一张这样的桌子：

---------------------------------- |姓名 |日期 |活动 | ---------------------------------- |约翰 |七月 |电子邮件 | |卡尔 |八月 |电话 | |约翰 |七月 |电话 | |罗伯特 |八月 |电话 | |卡尔 |九月 |电子邮件 | |约翰 |八月 |电话 | |卡尔 |八月 |电子邮件 | |约翰 |七月 |电子邮件 | |罗伯特 |九月 |电话 | |卡尔 |八月 |电子邮件 | ----------------------------------

我计算了按日期和广告系列分组的数据，但我想要一个额外的列来为我提供包含该广告系列的总行数

我使用的查询：

选择活动、名称、 SUM(IF(date = 'July',1,0)) AS 七月， SUM(IF(date = 'August',1,0)) AS 八月， SUM(IF(date = 'September',1,0)) AS 9 月 从表 按名称、活动分组

但我想修改它以获得以下输出：

-------------------------------------------------- -------------------------------------- |活动 |姓名 |七月 |八月 |九月 |七月总和 |八月总和 |九月总和 | -------------------------------------------------- -------------------------------------- 电子邮件约翰 2 0 0 2 2 1 电话约翰 1 1 0 1 3 1 …… ……

我想要按月份区分电话或电子邮件的所有值的总和的列

添加：http://sqlfiddle.com/#!9/8b797a/8

Answer 1

试试下面：http://sqlfiddle.com/#!9/8b797a/24:

select a.campaign,a.name,July, August,September,Julysum,Augustsum,Septembersum from 
(SELECT campaign,name,
  SUM(IF(date = 'July',1,0)) AS July,
  SUM(IF(date = 'August',1,0)) AS August,
  SUM(IF(date = 'September',1,0)) AS September
  FROM `table`
  GROUP BY campaign,name)a
  left join
  (select campaign,
  SUM(IF(date = 'July',1,0)) AS Julysum,
  SUM(IF(date = 'August',1,0)) AS Augustsum,
  SUM(IF(date = 'September',1,0)) AS Septembersum
  FROM `table`
  GROUP BY campaign)b on a.campaign=b.campaign
  where name='John'

输出：

campaign    name    July    August  September   campaign    Julysum Augustsum   Septembersum
Email      John     2      0       0           Email         2     2    1
Phone      John     1      1       0           Phone         1     3    1

Answer 2

我知道这不是您所要求的，但这是使用 GROUP BY ... WITH ROLLUP 获取总数的简单方法：

SELECT Campaign, Name,
  SUM(CASE WHEN Date='July' THEN 1 ELSE 0 END) AS July,
  SUM(CASE WHEN Date='August' THEN 1 ELSE 0 END) AS August,
  SUM(CASE WHEN Date='September' THEN 1 ELSE 0 END) AS September
FROM campaigns
GROUP BY Campaign, Name WITH ROLLUP

输出：

Campaign    Name    July    August  September
Email       Carl    0       2       1
Email       John    2       0       0
Email       (null)  2       2       1
Phone       Carl    0       1       0
Phone       John    1       1       0
Phone       Robert  0       1       1
Phone       (null)  1       3       1
(null)      (null)  3       5       2

每种类型的活动每月的总数显示在活动名称和NULL 值（Name）的行中。每个月（两种类型的广告系列）的总计显示在底部一行，NULL 的值为 Campaign 和 Name。

SQLFiddle Demo