SQL2005中利用PIVOT实现分组统计
2009-10-30 00:00:00 来源:WEB开发网select [Student],[数学],[英语],[中文],([数学]+[英语]+[中文]) AS 总分 FROM (SELECT [Student],[Score],[Subject] FROM [StudentsScore]) AS T PIVOT(sum([Score]) FOR [Subject] IN ( [数学], [英语], [中文])) AS thePivot ORDER BY [Student]
这样一来,在列数已知的情况下,我们就可以直接构造类似的语句,而不需要定义变量。
下面是本文中用到的数据表及数据记录的SQL,方便大家测试。
数据表脚本:
/****** 对象: Table [dbo].[StudentsScore] 脚本日期: 10/29/2009 22:56:18 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
SET ANSI_PADDING ON
GO
CREATE TABLE [dbo].[StudentsScore](
[Student] [varchar](50) COLLATE Chinese_PRC_CI_AS NULL,
[Subject] [varchar](50) COLLATE Chinese_PRC_CI_AS NULL,
[Score] [int] NULL
) ON [PRIMARY]
GO
SET ANSI_PADDING OFF
数据记录脚本:
Insert into StudentsScore (Student,Subject,Score) values ( '学生A', '中文', 80 );
Insert into StudentsScore (Student,Subject,Score) values ( '学生A', '数学', 78 );
Insert into StudentsScore (Student,Subject,Score) values ( '学生A', '英语', 92 );
Insert into StudentsScore (Student,Subject,Score) values ( '学生B', '中文', 89 );
Insert into StudentsScore (Student,Subject,Score) values ( '学生B', '数学', 87 );
Insert into StudentsScore (Student,Subject,Score) values ( '学生B', '英语', 75 );
Insert into StudentsScore (Student,Subject,Score) values ( '学生C', '中文', 92 );
Insert into StudentsScore (Student,Subject,Score) values ( '学生C', '数学', 74 );
Insert into StudentsScore (Student,Subject,Score) values ( '学生C', '英语', 65 );
Insert into StudentsScore (Student,Subject,Score) values ( '学生D', '中文', 79 );
Insert into StudentsScore (Student,Subject,Score) values ( '学生D', '数学', 83 );
Insert into StudentsScore (Student,Subject,Score) values ( '学生D', '英语', 81 );
Insert into StudentsScore (Student,Subject,Score) values ( '学生E', '中文', 73 );
Insert into StudentsScore (Student,Subject,Score) values ( '学生E', '数学', 84 );
Insert into StudentsScore (Student,Subject,Score) values ( '学生E', '英语', 93 );
Insert into StudentsScore (Student,Subject,Score) values ( '学生F', '中文', 79 );
Insert into StudentsScore (Student,Subject,Score) values ( '学生F', '数学', 86 );
Insert into StudentsScore (Student,Subject,Score) values ( '学生F', '英语', 84 );
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