如何在MySQL中返回数据透视表输出?
如果我有一个类似以下内容的MySQL表: company_name action pagecount ------------------------------- Company A PRINT 3 Company A PRINT 2 Company A PRINT 3 Company B EMAIL Company B PRINT 2 Company B PRINT 2 Company B PRINT 1 Company A PRINT 3 company_name EMAIL PRINT 1 pages PRINT 2 pages PRINT 3 pages ------------------------------------------------------------- CompanyA 0 0 1 3 CompanyB 1 1 2 0如何在MySQL中返回数据透视表输出?,mysql,sql,pivot,Mysql,Sql,Pivot,如果我有一个类似以下内容的MySQL表: company_name action pagecount ------------------------------- Company A PRINT 3 Company A PRINT 2 Company A PRINT 3 Company B EMAIL Company B PRINT 2 Company B PRINT 2 Company
CREATE TABLE `test_pivot` (
`pid` bigint(20) NOT NULL AUTO_INCREMENT,
`company_name` varchar(32) DEFAULT NULL,
`action` varchar(16) DEFAULT NULL,
`pagecount` bigint(20) DEFAULT NULL,
PRIMARY KEY (`pid`)
) ENGINE=MyISAM;
SELECT P.`company_name`,
COUNT(
CASE
WHEN P.`action`='EMAIL'
THEN 1
ELSE NULL
END
) AS 'EMAIL',
COUNT(
CASE
WHEN P.`action`='PRINT' AND P.`pagecount` = '1'
THEN P.`pagecount`
ELSE NULL
END
) AS 'PRINT 1 pages',
COUNT(
CASE
WHEN P.`action`='PRINT' AND P.`pagecount` = '2'
THEN P.`pagecount`
ELSE NULL
END
) AS 'PRINT 2 pages',
COUNT(
CASE
WHEN P.`action`='PRINT' AND P.`pagecount` = '3'
THEN P.`pagecount`
ELSE NULL
END
) AS 'PRINT 3 pages'
FROM test_pivot P
GROUP BY P.`company_name`;
公司名称操作页面计数
-------------------------------
A公司印刷品3
A公司印刷品2
A公司印刷品3
B公司电子邮件
B公司印刷品2
B公司印刷品2
B公司打印1
A公司印刷品3
是否可以运行MySQL查询以获得如下输出:
company_name action pagecount
-------------------------------
Company A PRINT 3
Company A PRINT 2
Company A PRINT 3
Company B EMAIL
Company B PRINT 2
Company B PRINT 2
Company B PRINT 1
Company A PRINT 3
company_name EMAIL PRINT 1 pages PRINT 2 pages PRINT 3 pages
-------------------------------------------------------------
CompanyA 0 0 1 3
CompanyB 1 1 2 0
CREATE TABLE `test_pivot` (
`pid` bigint(20) NOT NULL AUTO_INCREMENT,
`company_name` varchar(32) DEFAULT NULL,
`action` varchar(16) DEFAULT NULL,
`pagecount` bigint(20) DEFAULT NULL,
PRIMARY KEY (`pid`)
) ENGINE=MyISAM;
SELECT P.`company_name`,
COUNT(
CASE
WHEN P.`action`='EMAIL'
THEN 1
ELSE NULL
END
) AS 'EMAIL',
COUNT(
CASE
WHEN P.`action`='PRINT' AND P.`pagecount` = '1'
THEN P.`pagecount`
ELSE NULL
END
) AS 'PRINT 1 pages',
COUNT(
CASE
WHEN P.`action`='PRINT' AND P.`pagecount` = '2'
THEN P.`pagecount`
ELSE NULL
END
) AS 'PRINT 2 pages',
COUNT(
CASE
WHEN P.`action`='PRINT' AND P.`pagecount` = '3'
THEN P.`pagecount`
ELSE NULL
END
) AS 'PRINT 3 pages'
FROM test_pivot P
GROUP BY P.`company_name`;
公司名称电子邮件打印1页打印2页打印3页
-------------------------------------------------------------
公司01 3
公司B 1 1 2 0
其思想是,pagecount
可以变化,因此输出列的数量应该反映这一点,每个action
/pagecount
对对应一列,然后是每个公司名称的点击次数。我不确定这是否称为透视表,但有人建议?这基本上是一个透视表
有关如何实现这一点的教程,请参见:
我建议阅读这篇文章,并根据您的需要调整此解决方案
更新
在上面的链接现在不再可用之后,我觉得有义务为所有在这里搜索mysql pivot答案的人提供一些额外的信息。它真的有大量的信息,我不会把所有的信息都放在这里(甚至更多,因为我不想复制他们的广博知识),但我将给出一些建议,说明如何以sql的方式处理数据透视表,通常以peku的例子为例,他首先提出了这个问题
也许链接很快就会回来,我会留意的
电子表格方式…
许多人只是使用MSExcel、OpenOffice或其他电子表格工具来实现这一目的。这是一个有效的解决方案,只需将数据复制到那里,然后使用GUI提供的工具来解决这个问题
但是。。。这不是问题,它甚至可能导致一些缺点,比如如何将数据放入电子表格,缩放问题等等
SQL方式…
考虑到他的桌子看起来像这样:
company_name action pagecount
-------------------------------
Company A PRINT 3
Company A PRINT 2
Company A PRINT 3
Company B EMAIL
Company B PRINT 2
Company B PRINT 2
Company B PRINT 1
Company A PRINT 3
company_name EMAIL PRINT 1 pages PRINT 2 pages PRINT 3 pages
-------------------------------------------------------------
CompanyA 0 0 1 3
CompanyB 1 1 2 0
CREATE TABLE `test_pivot` (
`pid` bigint(20) NOT NULL AUTO_INCREMENT,
`company_name` varchar(32) DEFAULT NULL,
`action` varchar(16) DEFAULT NULL,
`pagecount` bigint(20) DEFAULT NULL,
PRIMARY KEY (`pid`)
) ENGINE=MyISAM;
SELECT P.`company_name`,
COUNT(
CASE
WHEN P.`action`='EMAIL'
THEN 1
ELSE NULL
END
) AS 'EMAIL',
COUNT(
CASE
WHEN P.`action`='PRINT' AND P.`pagecount` = '1'
THEN P.`pagecount`
ELSE NULL
END
) AS 'PRINT 1 pages',
COUNT(
CASE
WHEN P.`action`='PRINT' AND P.`pagecount` = '2'
THEN P.`pagecount`
ELSE NULL
END
) AS 'PRINT 2 pages',
COUNT(
CASE
WHEN P.`action`='PRINT' AND P.`pagecount` = '3'
THEN P.`pagecount`
ELSE NULL
END
) AS 'PRINT 3 pages'
FROM test_pivot P
GROUP BY P.`company_name`;
现在查看他/她想要的表格:
company_name EMAIL PRINT 1 pages PRINT 2 pages PRINT 3 pages
-------------------------------------------------------------
CompanyA 0 0 1 3
CompanyB 1 1 2 0
行(电子邮件
,打印x页
)类似于条件。主要分组方式为公司名称
为了设置条件,这相当于使用-语句。为了按某物分组,那么,使用<代码>分组依据
提供此数据透视的基本SQL可以如下所示:
company_name action pagecount
-------------------------------
Company A PRINT 3
Company A PRINT 2
Company A PRINT 3
Company B EMAIL
Company B PRINT 2
Company B PRINT 2
Company B PRINT 1
Company A PRINT 3
company_name EMAIL PRINT 1 pages PRINT 2 pages PRINT 3 pages
-------------------------------------------------------------
CompanyA 0 0 1 3
CompanyB 1 1 2 0
CREATE TABLE `test_pivot` (
`pid` bigint(20) NOT NULL AUTO_INCREMENT,
`company_name` varchar(32) DEFAULT NULL,
`action` varchar(16) DEFAULT NULL,
`pagecount` bigint(20) DEFAULT NULL,
PRIMARY KEY (`pid`)
) ENGINE=MyISAM;
SELECT P.`company_name`,
COUNT(
CASE
WHEN P.`action`='EMAIL'
THEN 1
ELSE NULL
END
) AS 'EMAIL',
COUNT(
CASE
WHEN P.`action`='PRINT' AND P.`pagecount` = '1'
THEN P.`pagecount`
ELSE NULL
END
) AS 'PRINT 1 pages',
COUNT(
CASE
WHEN P.`action`='PRINT' AND P.`pagecount` = '2'
THEN P.`pagecount`
ELSE NULL
END
) AS 'PRINT 2 pages',
COUNT(
CASE
WHEN P.`action`='PRINT' AND P.`pagecount` = '3'
THEN P.`pagecount`
ELSE NULL
END
) AS 'PRINT 3 pages'
FROM test_pivot P
GROUP BY P.`company_name`;
这将很快提供所需的结果。这种方法的主要缺点是,希望透视表中的行越多,需要在SQL语句中定义的条件就越多
这也是可以处理的,因此人们倾向于使用预先准备好的语句、例程、计数器等等
有关此主题的其他一些链接:
- 这基本上是一个数据透视表
有关如何实现这一点的教程,请参见:
我建议阅读这篇文章,并根据您的需要调整此解决方案
更新
在上面的链接现在不再可用之后,我觉得有义务为所有在这里搜索mysql pivot答案的人提供一些额外的信息。它真的有大量的信息,我不会把所有的信息都放在这里(甚至更多,因为我不想复制他们的广博知识),但我将给出一些建议,说明如何以sql的方式处理数据透视表,通常以peku的例子为例,他首先提出了这个问题
也许链接很快就会回来,我会留意的
电子表格方式…
许多人只是使用MSExcel、OpenOffice或其他电子表格工具来实现这一目的。这是一个有效的解决方案,只需将数据复制到那里,然后使用GUI提供的工具来解决这个问题
但是。。。这不是问题,它甚至可能导致一些缺点,比如如何将数据放入电子表格,缩放问题等等
SQL方式…
考虑到他的桌子看起来像这样:
company_name action pagecount
-------------------------------
Company A PRINT 3
Company A PRINT 2
Company A PRINT 3
Company B EMAIL
Company B PRINT 2
Company B PRINT 2
Company B PRINT 1
Company A PRINT 3
company_name EMAIL PRINT 1 pages PRINT 2 pages PRINT 3 pages
-------------------------------------------------------------
CompanyA 0 0 1 3
CompanyB 1 1 2 0
CREATE TABLE `test_pivot` (
`pid` bigint(20) NOT NULL AUTO_INCREMENT,
`company_name` varchar(32) DEFAULT NULL,
`action` varchar(16) DEFAULT NULL,
`pagecount` bigint(20) DEFAULT NULL,
PRIMARY KEY (`pid`)
) ENGINE=MyISAM;
SELECT P.`company_name`,
COUNT(
CASE
WHEN P.`action`='EMAIL'
THEN 1
ELSE NULL
END
) AS 'EMAIL',
COUNT(
CASE
WHEN P.`action`='PRINT' AND P.`pagecount` = '1'
THEN P.`pagecount`
ELSE NULL
END
) AS 'PRINT 1 pages',
COUNT(
CASE
WHEN P.`action`='PRINT' AND P.`pagecount` = '2'
THEN P.`pagecount`
ELSE NULL
END
) AS 'PRINT 2 pages',
COUNT(
CASE
WHEN P.`action`='PRINT' AND P.`pagecount` = '3'
THEN P.`pagecount`
ELSE NULL
END
) AS 'PRINT 3 pages'
FROM test_pivot P
GROUP BY P.`company_name`;
现在查看他/她想要的表格:
company_name EMAIL PRINT 1 pages PRINT 2 pages PRINT 3 pages
-------------------------------------------------------------
CompanyA 0 0 1 3
CompanyB 1 1 2 0
行(电子邮件
,打印x页
)类似于条件。主要分组方式为公司名称
为了设置条件,这相当于使用-语句。为了按某物分组,那么,使用<代码>分组依据
提供此数据透视的基本SQL可以如下所示:
company_name action pagecount
-------------------------------
Company A PRINT 3
Company A PRINT 2
Company A PRINT 3
Company B EMAIL
Company B PRINT 2
Company B PRINT 2
Company B PRINT 1
Company A PRINT 3
company_name EMAIL PRINT 1 pages PRINT 2 pages PRINT 3 pages
-------------------------------------------------------------
CompanyA 0 0 1 3
CompanyB 1 1 2 0
CREATE TABLE `test_pivot` (
`pid` bigint(20) NOT NULL AUTO_INCREMENT,
`company_name` varchar(32) DEFAULT NULL,
`action` varchar(16) DEFAULT NULL,
`pagecount` bigint(20) DEFAULT NULL,
PRIMARY KEY (`pid`)
) ENGINE=MyISAM;
SELECT P.`company_name`,
COUNT(
CASE
WHEN P.`action`='EMAIL'
THEN 1
ELSE NULL
END
) AS 'EMAIL',
COUNT(
CASE
WHEN P.`action`='PRINT' AND P.`pagecount` = '1'
THEN P.`pagecount`
ELSE NULL
END
) AS 'PRINT 1 pages',
COUNT(
CASE
WHEN P.`action`='PRINT' AND P.`pagecount` = '2'
THEN P.`pagecount`
ELSE NULL
END
) AS 'PRINT 2 pages',
COUNT(
CASE
WHEN P.`action`='PRINT' AND P.`pagecount` = '3'
THEN P.`pagecount`
ELSE NULL
END
) AS 'PRINT 3 pages'
FROM test_pivot P
GROUP BY P.`company_name`;
这将很快提供所需的结果。这种方法的主要缺点是,希望透视表中的行越多,需要在SQL语句中定义的条件就越多
这也是可以处理的,因此人们倾向于使用预先准备好的语句、例程、计数器等等
有关此主题的其他一些链接:
SELECT
CompanyName,
SUM(CASE WHEN (action='EMAIL') THEN 1 ELSE 0 END) AS Email,
SUM(CASE WHEN (action='PRINT' AND pagecount=1) THEN 1 ELSE 0 END) AS Print1Pages,
SUM(CASE WHEN (action='PRINT' AND pagecount=2) THEN 1 ELSE 0 END) AS Print2Pages,
SUM(CASE WHEN (action='PRINT' AND pagecount=3) THEN 1 ELSE 0 END) AS Print3Pages
FROM
Company
GROUP BY
CompanyName
我的解决方案是T-SQL,没有任何数据透视:
SELECT
CompanyName,
SUM(CASE WHEN (action='EMAIL') THEN 1 ELSE 0 END) AS Email,
SUM(CASE WHEN (action='PRINT' AND pagecount=1) THEN 1 ELSE 0 END) AS Print1Pages,
SUM(CASE WHEN (action='PRINT' AND pagecount=2) THEN 1 ELSE 0 END) AS Print2Pages,
SUM(CASE WHEN (action='PRINT' AND pagecount=3) THEN 1 ELSE 0 END) AS Print3Pages
FROM
Company
GROUP BY
CompanyName
对于MySQL,您可以直接将条件放入
SUM()
函数中,它将作为布尔值0
或1
进行计算,因此您可以根据您的条件进行计数,而无需使用IF/CASE
语句
SELECT
company_name,
SUM(action = 'EMAIL')AS Email,
SUM(action = 'PRINT' AND pagecount = 1)AS Print1Pages,
SUM(action = 'PRINT' AND pagecount = 2)AS Print2Pages,
SUM(action = 'PRINT' AND pagecount = 3)AS Print3Pages
FROM t
GROUP BY company_name
对于MySQL,您可以直接将条件放入
SUM()
函数中,它将作为布尔值0
或1
进行计算,因此您可以根据您的条件进行计数,而无需使用IF/CASE
语句
SELECT
company_name,
SUM(action = 'EMAIL')AS Email,
SUM(action = 'PRINT' AND pagecount = 1)AS Print1Pages,
SUM(action = 'PRINT' AND pagecount = 2)AS Print2Pages,
SUM(action = 'PRINT' AND pagecount = 3)AS Print3Pages
FROM t
GROUP BY company_name
对于动态轴心,请使用
GROUP_CONCAT
和CONCAT
。
该函数使用各种选项将组中的字符串连接为一个字符串
SET @sql = NULL;
SELECT
GROUP_CONCAT(DISTINCT
CONCAT(
'SUM(CASE WHEN action = "',
action,'" AND ',
(CASE WHEN pagecount IS NOT NULL
THEN CONCAT("pagecount = ",pagecount)
ELSE pagecount IS NULL END),
' THEN 1 ELSE 0 end) AS ',
action, IFNULL(pagecount,'')
)
)
INTO @sql
FROM
t;
SET @sql = CONCAT('SELECT company_name, ', @sql, '
FROM t
GROUP BY company_name');
PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;
对于动态枢轴,u