SQL交叉表的实例(横表转纵表)
2010-07-14 16:42
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很简单的一个东西,见网上好多朋友问“怎么实现交叉表?”,以下是我写的一个例子,数据库基于SQL SERVER 2000。
交叉表实例
建表:
在查询分析器里运行:
CREATE TABLE [Test] (
[id] [int] IDENTITY (1, 1) NOT NULL ,
[name] [nvarchar] (50) COLLATE Chinese_PRC_CI_AS NULL ,
[subject] [nvarchar] (50) COLLATE Chinese_PRC_CI_AS NULL ,
[Source] [numeric](18, 0) NULL
) ON [PRIMARY]
GO
INSERT INTO [test] ([name],[subject],[Source]) values (N'张三',N'语文',60)
INSERT INTO [test] ([name],[subject],[Source]) values (N'李四',N'数学',70)
INSERT INTO [test] ([name],[subject],[Source]) values (N'王五',N'英语',80)
INSERT INTO [test] ([name],[subject],[Source]) values (N'王五',N'数学',75)
INSERT INTO [test] ([name],[subject],[Source]) values (N'王五',N'语文',57)
INSERT INTO [test] ([name],[subject],[Source]) values (N'李四',N'语文',80) [bitsCN.Com]
INSERT INTO [test] ([name],[subject],[Source]) values (N'张三',N'英语',100)
Go
![](http://www.bitscn.com/upimg/2006-04-12/195049_01_305.jpg)
交叉表语句的实现:
用于:交叉表的列数是确定的
select name,sum(case subject when '数学' then source else 0 end) as '数学',
sum(case subject when '英语' then source else 0 end) as '英语',
sum(case subject when '语文' then source else 0 end) as '语文'
from test
group by name
--用于:交叉表的列数是不确定的
declare @sql varchar(8000)
set @sql = 'select name,'
select @sql = @sql + 'sum(case subject when '''+subject+'''
then source else 0 end) as '''+subject+''','
from (select distinct subject from test) as a
select @sql = left(@sql,len(@sql)-1) + ' from test group by name'
exec(@sql)
go
![](http://www.bitscn.com/upimg/2006-04-12/195050_02_976.jpg)
MS Server的Analysis Services組件是專門用來做交叉表的處理
Microsoft SQL Server 2000 Analysis Services
自己***的过程:
CREATE Table allen_test(
id NUMBER(8,0) NOT NULL ,
name VARCHAR2(30) NOT NULL ,
subject VARCHAR2(30) NOT NULL ,
Source NUMBER(8,2) ,
PRIMARY Key (Id)
);
COMMENT ON Column allen_test.Id IS '序号';
COMMENT ON Column allen_test.Name IS '姓名';
COMMENT ON Column allen_test.subject IS '学科';
COMMENT ON Column allen_test.Source IS '分数';
INSERT Into allen_test values (1, '张三','语文',60);
INSERT INTO allen_test values (2, '李四','数学',70);
INSERT Into allen_test values (3, '王五','英语',80);
INSERT INTO allen_test values (4, '王五','数学',75);
INSERT INTO allen_test values (5, '王五','语文',57);
INSERT INTO allen_test values (6, '李四','语文',80) ;
INSERT INTO allen_test values (7, '张三','英语',100);
select name,
sum(case subject when '数学' then source else 0 end) As 数学,
sum(case subject when '英语' then source else 0 end) as 英语,
sum(case subject when '语文' then source else 0 end) as 语文
from allen_test
group by Name;
交叉表实例
建表:
在查询分析器里运行:
CREATE TABLE [Test] (
[id] [int] IDENTITY (1, 1) NOT NULL ,
[name] [nvarchar] (50) COLLATE Chinese_PRC_CI_AS NULL ,
[subject] [nvarchar] (50) COLLATE Chinese_PRC_CI_AS NULL ,
[Source] [numeric](18, 0) NULL
) ON [PRIMARY]
GO
INSERT INTO [test] ([name],[subject],[Source]) values (N'张三',N'语文',60)
INSERT INTO [test] ([name],[subject],[Source]) values (N'李四',N'数学',70)
INSERT INTO [test] ([name],[subject],[Source]) values (N'王五',N'英语',80)
INSERT INTO [test] ([name],[subject],[Source]) values (N'王五',N'数学',75)
INSERT INTO [test] ([name],[subject],[Source]) values (N'王五',N'语文',57)
INSERT INTO [test] ([name],[subject],[Source]) values (N'李四',N'语文',80) [bitsCN.Com]
INSERT INTO [test] ([name],[subject],[Source]) values (N'张三',N'英语',100)
Go
![](http://www.bitscn.com/upimg/2006-04-12/195049_01_305.jpg)
交叉表语句的实现:
用于:交叉表的列数是确定的
select name,sum(case subject when '数学' then source else 0 end) as '数学',
sum(case subject when '英语' then source else 0 end) as '英语',
sum(case subject when '语文' then source else 0 end) as '语文'
from test
group by name
--用于:交叉表的列数是不确定的
declare @sql varchar(8000)
set @sql = 'select name,'
select @sql = @sql + 'sum(case subject when '''+subject+'''
then source else 0 end) as '''+subject+''','
from (select distinct subject from test) as a
select @sql = left(@sql,len(@sql)-1) + ' from test group by name'
exec(@sql)
go
![](http://www.bitscn.com/upimg/2006-04-12/195050_02_976.jpg)
MS Server的Analysis Services組件是專門用來做交叉表的處理
Microsoft SQL Server 2000 Analysis Services
自己***的过程:
CREATE Table allen_test(
id NUMBER(8,0) NOT NULL ,
name VARCHAR2(30) NOT NULL ,
subject VARCHAR2(30) NOT NULL ,
Source NUMBER(8,2) ,
PRIMARY Key (Id)
);
COMMENT ON Column allen_test.Id IS '序号';
COMMENT ON Column allen_test.Name IS '姓名';
COMMENT ON Column allen_test.subject IS '学科';
COMMENT ON Column allen_test.Source IS '分数';
INSERT Into allen_test values (1, '张三','语文',60);
INSERT INTO allen_test values (2, '李四','数学',70);
INSERT Into allen_test values (3, '王五','英语',80);
INSERT INTO allen_test values (4, '王五','数学',75);
INSERT INTO allen_test values (5, '王五','语文',57);
INSERT INTO allen_test values (6, '李四','语文',80) ;
INSERT INTO allen_test values (7, '张三','英语',100);
select name,
sum(case subject when '数学' then source else 0 end) As 数学,
sum(case subject when '英语' then source else 0 end) as 英语,
sum(case subject when '语文' then source else 0 end) as 语文
from allen_test
group by Name;