数据库行列转换sql

经常折腾数据库，常常遇到数据库行列转换的问题，下面就用一个小例子来演示下如何进行行列转换。

1.创建一张表

CREATE TABLE [android_source](

    [CREATETIME] [datetime] NULL,

    [SOURCE] [nvarchar](255) NULL,

    [COUNT] [float] NULL

)

2.插入测试数据

insert android_source (CREATETIME,SOURCE,COUNT)  values ( '2013-07-13 00:00:00.000','1xingdong',3);

insert android_source (CREATETIME,SOURCE,COUNT)  values ( '2013-07-13 00:00:00.000','eoemarket',1);

insert android_source (CREATETIME,SOURCE,COUNT)  values ( '2013-07-13 00:00:00.000','lenovomm',2);

insert android_source (CREATETIME,SOURCE,COUNT)  values ( '2013-07-13 00:00:00.000','mqidian',2);

insert android_source (CREATETIME,SOURCE,COUNT)  values ( '2013-07-13 00:00:00.000','mumayi',5);

insert android_source (CREATETIME,SOURCE,COUNT)  values ( '2013-07-13 00:00:00.000','nduoa',1);

insert android_source (CREATETIME,SOURCE,COUNT)  values ( '2013-07-13 00:00:00.000','paojiao',4);

insert android_source (CREATETIME,SOURCE,COUNT)  values ( '2013-07-13 00:00:00.000','qidian',5);

insert android_source (CREATETIME,SOURCE,COUNT)  values ( '2013-07-14 00:00:00.000','1xingdong',20);

insert android_source (CREATETIME,SOURCE,COUNT)  values ( '2013-07-14 00:00:00.000','eoemarket',7);

insert android_source (CREATETIME,SOURCE,COUNT)  values ( '2013-07-14 00:00:00.000','lenovomm',21);

insert android_source (CREATETIME,SOURCE,COUNT)  values ( '2013-07-14 00:00:00.000','mqidian',43);

insert android_source (CREATETIME,SOURCE,COUNT)  values ( '2013-07-14 00:00:00.000','mumayi',17);

insert android_source (CREATETIME,SOURCE,COUNT)  values ( '2013-07-14 00:00:00.000','nduoa',14);

insert android_source (CREATETIME,SOURCE,COUNT)  values ( '2013-07-14 00:00:00.000','paojiao',8);

insert android_source (CREATETIME,SOURCE,COUNT)  values ( '2013-07-14 00:00:00.000','qidian',72);

insert android_source (CREATETIME,SOURCE,COUNT)  values ( '2013-07-15 00:00:00.000','1xingdong',30);

insert android_source (CREATETIME,SOURCE,COUNT)  values ( '2013-07-15 00:00:00.000','eoemarket',22);

insert android_source (CREATETIME,SOURCE,COUNT)  values ( '2013-07-15 00:00:00.000','lenovomm',32);

3.列转行

SELECT 

      CONVERT(varchar(10), [CREATETIME],120) as CreateTime, 

      MAX(CASE [SOURCE] WHEN 'qidian' THEN [COUNT] ELSE 0 END) AS 'qidian',

      MAX(CASE [SOURCE] WHEN 'paojiao' THEN [COUNT] ELSE 0 END) AS 'paojiao',

      MAX(CASE [SOURCE] WHEN 'nduoa' THEN [COUNT] ELSE 0 END) AS 'nduoa',

      MAX(CASE [SOURCE] WHEN 'mumayi' THEN [COUNT] ELSE 0 END) AS 'mumayi',

      MAX(CASE [SOURCE] WHEN 'mqidian' THEN [COUNT] ELSE 0 END) AS 'mqidian',

      MAX(CASE [SOURCE] WHEN 'lenovomm' THEN [COUNT] ELSE 0 END) AS 'lenovomm',

      MAX(CASE [SOURCE] WHEN 'eoemarket' THEN [COUNT] ELSE 0 END) AS 'eoemarket',

      MAX(CASE [SOURCE] WHEN 'dbank' THEN [COUNT] ELSE 0 END) AS 'dbank',

      MAX(CASE [SOURCE] WHEN '1xingdong' THEN [COUNT] ELSE 0 END) AS '1xingdong'

FROM [MyDataBase].[dbo].android_source

GROUP BY CONVERT(varchar(10), [CREATETIME],120)

结果：