详细介绍SQL交叉表的实例
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。<br /> <br /> 交叉表实例<br /> <br /> 建表：<br /> <br /> 在查询分析器里运行：<br /> <br /> CREATE TABLE (<br /> <br /> IDENTITY (1, 1) NOT NULL ,<br /> <br /> (50) COLLATE Chinese_PRC_CI_AS NULL ,<br /> <br /> (50) COLLATE Chinese_PRC_CI_AS NULL ,<br /> <br /> (18, 0) NULL<br /> <br /> ) ON <br /> <br /> GO<br /> <br /> INSERT INTO (,,) values (N'张三',N'语文',60)<br /> <br /> INSERT INTO (,,) values (N'李四',N'数学',70)<br /> <br /> INSERT INTO (,,) values (N'王五',N'英语',80)<br /> <br /> INSERT INTO (,,) values (N'王五',N'数学',75)<br /> <br /> INSERT INTO (,,) values (N'王五',N'语文',57)<br /> <br /> INSERT INTO (,,) values (N'李四',N'语文',80)<br /> <br /> INSERT INTO (,,) values (N'张三',N'英语',100)<br /> <br /> Go<br /> <center> </center><br /> 交叉表语句的实现：<br /> <br /> 用于：交叉表的列数是确定的<br /> <br /> select name,sum(case subject when '数学' then source else 0 end) as '数学',<br /> <br /> sum(case subject when '英语' then source else 0 end) as '英语',<br /> <br /> sum(case subject when '语文' then source else 0 end) as '语文'<br /> <br /> from test<br /> <br /> group by name<br /> <br /> --用于：交叉表的列数是不确定的<br /> <br /> declare @sql varchar(8000)<br /> <br /> set @sql = 'select name,'<br /> <br /> select @sql = @sql + 'sum(case subject when '''+subject+'''<br /> <br /> then source else 0 end) as '''+subject+''','<br /> <br /> from (select distinct subject from test) as a<br /> <br /> select @sql = left(@sql,len(@sql)-1) + ' from test group by name'<br /> <br /> exec(@sql)<br /> <br /> go<br /> <br /> 运行结果：<br /> <center> </center>
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