使用字符串值而不是整数对 id 进行分组 SQL GROUP BY

Question

在谷歌上，我刚刚找到了按总和（整数值）分组。如何按字符串值分组？对于表格：

No   Place    Car 
---  ------   --------
1    NY       VRM1
1    BT       VLI
2    NY       GAR
3    GT       GAR

如何按“否”分组？我尝试过：

SELECT No, place, Car 
FROM  APPEL
GROUP BY No, Place, Car

但没有成功。

我想要一张这样的桌子

No   Place    Car 
---  ------   --------
1    NY,BT    VRM1,VLI
2    NY       GAR
3    GT       GAR

Answer 1

-- Sample data
with T (No,   Place,    Car) as
(
select 1,    'NY',       'VRM1' union all
select 1,    'BT',       'VLI' union all
select 2,    'NY',       'GAR' union all
select 3,    'GT',       'GAR'
)

-- The query
select
  T.No,
  stuff((select ','+T2.Place
         from T as T2 
         where T.No = T2.No
         for xml path(''), type).value('.', 'nvarchar(max)'), 1, 1, '') as Place,
  stuff((select ','+T2.Car
         from T as T2 
         where T.No = T2.No
         for xml path(''), type).value('.', 'nvarchar(max)'), 1, 1, '') as Car
from T
group by T.No