在SQL Server中的不同列中选择一列数据

Question

我必须匹配两个表table1和table2，对于table1的一行，我在表2中有两行或更多行，我想在一行中显示它们。

现在我有以下内容：

Select
    a.[ID], b.[Description]
From 
    table1 a, table2 b 
Where 
    a.[ID] = b.[ID];

输出：

[ID] | [Description]
-----+--------------
1    | Fee
1    | Domestic Fee
2    | Fee
2    | International Fee 

我想得到以下结果

[ID] | [Description1] | [Description2]
-----+----------------+---------------
1    | Fee            | Domestic Fee
2    | Fee            | International Fee

先感谢您 ：）

Answer 1

如果您有多个描述，则可以如下使用Pivot：

Select * from (
    Select *, RowN = Concat('Description', Row_Number() over (partition by Id order by Id)) from #description ) a
    pivot (max([Description]) for RowN in ([Description1],[Description2])) p

输出如下：

+----+--------------+-------------------+
| Id | Description1 |   Description2    |
+----+--------------+-------------------+
|  1 | Fee          | Domestic Fee      |
|  2 | Fee          | International Fee |
+----+--------------+-------------------+

Answer 2

这是我对交叉申请运营商的建议

数据准备：

create table tst_1 (id int, dsc nvarchar(30))

insert into tst_1 (id, dsc)
values (1,'Fee'),(1,'Domestic Fee'),(2,'Fee'),(2,'International Fee')

带有jon的下一个简单选择显示您想要的数据：

select t1.id, t1.dsc, x.dsc
from tst_1 t1
cross apply ( select row_number() over (order by id) as lp
                                        ,id
                                        ,dsc
                            from tst_1 )x
where x.id = t1.id and x.dsc <> t1.dsc
and lp%2 = 0

tst_1可以是基于您select ...问题的视图。

Answer 3

Select
    a.[ID],a.[Description], b.[Description]
From 
    table1 a left outer join table2 b 
on
    a.[ID] = b.[ID];``

Answer 4

尝试这个：

select ID, DESCRIPTION1, DESCRIPTION2
from
(
    Select a.[ID]
      ,b.[Description]
      ,'DESCRIPTION' + CAST(ROW_NUMBER() OVER(PARTITION BY a.ID ORDER BY a.ID) AS VARCHAR(255))AS RN
  from table1 a 
  JOIN  table2 b ON  a.[ID] = b.[ID] 
) d
pivot
(
  max([Description])
  for RN in (DESCRIPTION1,DESCRIPTION2)
) piv;