动态列名数据视图实现

测试环境:

select @@VERSION
/*
Microsoft SQL Server 2008 (RTM) - 10.0.1600.22 (Intel X86) 
	Jul  9 2008 14:43:34 
	Copyright (c) 1988-2008 Microsoft Corporation
	Developer Edition on Windows NT 6.1 <X86> (Build 7601: Service Pack 1)
*/

--以下实现如果任何列的值全部为4时，不显示该列。

use master
go
sp_configure 'show advanced options', 1;
GO
RECONFIGURE;
GO
sp_configure 'Ad Hoc Distributed Queries', 1; --开启OpenRowset/OpenDatasource的访问
GO
RECONFIGURE;
GO
 
--测试
use Tempdb
go
--> --> 
 set nocount on;
if not object_id(N'T','U') is null
    drop table T
Go
create table t(F1 int,F2 int,F3 int,F4 int,F5 int,F6 int,F7 int,F8 int,F9 int)
insert into t select 4,3,2,4,2,3,4,2,6
insert into t select 4,1,3,4,2,4,2,3,5
insert into t select 4,1,3,4,2,6,3,4,5
insert into t select 4,2,1,4,3,2,4,1,3
Go
if OBJECT_ID('p1','P') is not null
	drop proc p1
go
CREATE PROCEDURE p1
as

set nocount on;

declare @s nvarchar(4000)
select @s=isnull(@s+',','')+quotename(Name)
from syscolumns 
where ID=object_id('T') and Name not in('Student') 
order by Colid


exec('declare @s nvarchar(4000),@i int
set @i=1
;with b
as
(
Select 
* 
from (select *, ROW_NUMBER()over( order by (select 1)) as row from T) as a
UNPIVOT
(VALUE FOR Cols IN('+@s+'))AS b
) 
select 
	@s=isnull(@s+'','','' select '')+quotename(Cols)+'' as T''+rtrim(@i),
	@i=@i+1 
from b 
where 
	not exists(select 1 from b as c  where c.Cols=b.Cols and VALUE=4  having COUNT(c.row)=(select MAX(row) from b))
group by Cols
exec(@s+'' from T'')
	') 

go
if OBJECT_ID('v_p1','v') is not null
	drop VIEW v_p1
go
CREATE VIEW v_p1
AS
SELECT * 
FROM OPENROWSET(
         'sqloledb', 
         'Trusted_Connection=yes',	--验证方式这里用信任连接，可用SQL Server认证的方式来代替
         'SET FMTONLY OFF;			--只将元数据返回给客户端。可以用于测试响应的格式，而不必实际执行查询。
          EXEC tempdb..p1 
         '
     )
go
select * from v_p1

/*
T1	T2	T3	T4	T5	T6	T7
3	2	2	3	4	2	6
1	3	2	4	2	3	5
1	3	2	6	3	4	5
2	1	3	2	4	1	3
*/

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