Question

我有三张桌子：

Flight table
 FlightId  int
 FlightNumber varchar(10)

FlightCapacity table
ID int
FlightIdRef int
ClassIdRef  int
Capacity    int

Class Table
ClassId  int
Name      varchar(10)

Class Table:
ClassId     Name
   1         Y
   2         A

Flight Table
FlightId   Number
1           123
2           423

FlightCapacity Table
Id   FlightIdRef    ClassIdref  Capacity
1       1              1          10
2       1              2          20
3       2              2          10

这是一个简单的查询：

select Flight.FlightNumber,Class.Name+RTRIM(FlightCapacity.Capacity)
   from  Flight
      inner join FlightCapacity
           on Flight.FlightId=FlightCapacity.FlightIdRef
               inner join Class
                    on FlightCapacity.ClassIdRef=Class.ClassId

但是我希望得到以下结果:(我想在一行中显示每个航班和容量的所有类别）

FlightNumber     ClassNameAndCapacity
  123                 Y10  A20
  423                 Y10

Answer 1

;WITH x(fn,cn) AS 
(
   SELECT f.FlightNumber, c.Name + RTRIM(fc.Capacity)
   FROM dbo.Flight AS f
   INNER JOIN dbo.FlightCapacity AS fc
   ON f.FlightId = fc.FlightIdRef
   INNER JOIN dbo.Class AS c
   ON fc.ClassIdRef = c.ClassId
)
SELECT DISTINCT 
    FlightNumber = fn, 
    ClassNameAndCapacity = (SELECT cn + ' ' 
      FROM x AS x2 
      WHERE x2.fn = x.fn 
      FOR XML PATH('')
    )
FROM x
ORDER BY FlightNumber;

如何显示结果查询列而不是逐行？

1 个答案: