SQL Server 2008表中的矩阵显示

Question

有谁知道如何从数据库表创建矩阵显示？
我正在使用ASP.NET C＃，数据库是SQL Server 2008。

该表如下所示。

我希望矩阵看起来像这样或类似。

Answer 1

使用TSQL枢轴

create table table1
(
    serverName varchar(30),
    app varchar(50)
);
go

insert table1 (serverName , app) values ('server1' , 'app A');
insert table1 (serverName , app) values ('server2' , 'app A');
insert table1 (serverName , app) values ('server2' , 'app B');
insert table1 (serverName , app) values ('server3' , 'app B');
insert table1 (serverName , app) values ('server1' , 'app C');
insert table1 (serverName , app) values ('server3' , 'app C');
go

create procedure GetPivotTable
as begin
DECLARE @PivotColumnHeaders VARCHAR(MAX)
SELECT @PivotColumnHeaders = 
  COALESCE(@PivotColumnHeaders + ',[' + cast(t.serverName as varchar) + ']' ,
  '[' + cast(t.serverName as varchar)+ ']')
FROM (select distinct serverName from table1) t


DECLARE @PivotTableSQL NVARCHAR(MAX)
SET @PivotTableSQL = N'
select * from
(select  app, serverName from table1)  sourceTable
pivot
(
    count(serverName) for serverName in (' + @PivotColumnHeaders + ')
) pivottable
'
EXECUTE(@PivotTableSQL)
end

go

exec GetPivotTable

Answer 2

我的建议是将数据完全按照您拥有的格式提取到实体列表中（最简单的方法）：

public class ServerApplicationRelationship
{
   public string Server{get;set;}
   public string Application{get;set;}
}

并创建一个自定义控件，该控件使用List<ServerApplicationRelationship>作为其数据源来呈现HTML表。

从提供的数据渲染该表应该非常容易。

如果您真的想从sql中以该形状提取数据，则可以使用以下查询

select application,
          case when exists(select 1 from example where application=ex.application and server='server 1') THEN 1 ELSE 0 end as [server 1],
          case when exists(select 1 from example where application=ex.application and server='server 2') THEN 1 ELSE 0 end as [server 2],
          case when exists(select 1 from example where application=ex.application and server='server 3') THEN 1 ELSE 0 end as [server 3]
    from yourTable ex
    group by application