Question

我有一张数据表。我需要以水平格式获取ID（第一列）和相关的2列数据。对于ID，对应LinkID出现的最大值为3。因此我们需要在3列之后开始显示PC相关数据。我已将第4列中的“ID的总发生次数”计算为TotalnoofoccurenceofID。

我的可用表是

ID      LinkID      PC      TotalnoofoccurenceofID          

10R46   R*1005      8017    2               
10R46   R*10335     5019    2               
100R91  R*1005      8017    1               
10R91   R*243       8870    1               
10M95   R*4918      8305    3               
10M95   R*9017      8305    3               
10M95   R*9470      8221    3

我想得到这样的结果集：

ID      TotalnoofoccurenceofID  LinkID1     LinkID2     LinkID3 PC1     PC2     PC3                             
10R46   2                       R*1005      R*10335             8017    5019    
100R91  1                       R*1005                          8017        
10R91   1                       R*243                           8870        
10M95   3                       R*4918      R*9017      R*9470  8305    8305    8221

如果我描述结果集，那么

First row  :ID 10R46 and related  2  LinkID(under LinkID1 and LinkID2) and related 2 PCs(under PC1 and PC2)

Second row :ID 100R91 and related 1  LinkID(under LinkID1) and related 1 PC(under PC1)

Third row  :ID 10R91 and related  1  LinkID(under LinkID1)  and related 1 PC(under PC1)

Fourth row :ID 10M95 and related  3  LinkID(under LinkID1,LinkID2,LinkID3) and related 3 PC(under PC1,PC2,PC3)

请注意，最大LinkID次出现为3，PC列在3 LinkID列之后开始。

非常感谢你。

Answer 1

检查一下，

Declare @t table(ID varchar(50),LinkID varchar(50),PC int, TotalnoofoccurenceofID int)             
insert into @t
select '10R46',   'R*1005',  8017,    2 union all            
select '10R46',   'R*10335', 5019,    2 union all               
select '100R91',  'R*1005',  8017,    1 union all               
select '10R91',   'R*243',   8870,    1 union all               
select '10M95',   'R*4918',  8305,     3 union all               
select '10M95',   'R*9017',  8305,    3 union all               
select '10M95',   'R*9470',  8221,    3 

;with cte as
(select *,ROW_NUMBER()over(partition by id order by id)rn from @t)

select a.ID,b.LinkID,c.LinkID,d.LinkID,b.PC,c.PC,d.PC from cte a
left join cte b on a.id=b.id and b.rn=1
left join cte c on a.id=c.id and c.rn=2
left join cte d on a.id=d.id and d.rn=3
where a.rn=1

使垂直正常行数据显示为水平格式

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