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详细介绍SQL交叉表的实例

2009-09-24 10:08 399 查看
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)

  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

  运行结果:

  


插入数据的另一种写法:

Insert Class
select N'张三',N'国語',78 union all
select N'张三',N'数学',87 union all
select N'张三',N'英語',82 union all
select N'张三',N'物理',90 union all
select N'李四',N'国語',65 union all
select N'李四',N'数学',77 union all
select N'李四',N'英語',65 union all
select N'李四',N'物理',85

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