交叉表实例

来源:互联网 发布:php artisan 命令 编辑:程序博客网 时间:2024/06/01 07:58

  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  

 

  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

 

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