如何顯示查詢結果columnar（在不同的列中）而不是逐行顯示？

Question

我在另一個帖子中問過這個問題，但我已經改變了。 我有三個表：

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 

這是一個簡單的查詢：

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 

但我想下面的結果：（我想顯示在一個單列每次飛行和能力的所有類，但在不同的列）

FlightNumber  ClassNameAndCapacity1 ClassNameAndCapacity2 ClassNameAndCapacityn 
    123     Y10       A20      
    423     Y10       ---      

Answer 1

也許是這樣的：

個

首先是一些測試數據：

CREATE TABLE Flight(FlightId int,FlightNumber varchar(10)) 
CREATE TABLE FlightCapacity(ID int,FlightIdRef int,ClassIdRef int,Capacity int) 
CREATE TABLE Class(ClassId int,Name varchar(10)) 

INSERT INTO Class VALUES(1,'Y'),(2,'A') 
INSERT INTO Flight VALUES(1,123),(2,423) 
INSERT INTO FlightCapacity VALUES(1,1,1,10),(2,1,2,20),(3,2,2,10) 

然後你必須得到獨特的列是這樣的：

DECLARE @cols VARCHAR(MAX) 
SELECT @cols = COALESCE(@cols + ','+ 
       QUOTENAME('ClassNameAndCapacity'+CAST(ClassId AS VARCHAR(10))), 
       QUOTENAME('ClassNameAndCapacity'+CAST(ClassId AS VARCHAR(10)))) 
FROM 
    Class 

的delcaring和執行動態SQL：

DECLARE @query NVARCHAR(4000)= 
N'SELECT 
    * 
FROM 
(
SELECT 
    Flight.FlightNumber, 
    Class.Name+CAST(FlightCapacity.Capacity AS VARCHAR(100)) AS ClassName, 
    ''ClassNameAndCapacity''+CAST(Class.ClassId AS VARCHAR(10)) AS ClassAndCapacity 
FROM 
    Flight 
    JOIN FlightCapacity 
     ON Flight.FlightId=FlightCapacity.FlightIdRef 
    JOIN Class 
     ON FlightCapacity.ClassIdRef=Class.ClassId 
) AS p 
PIVOT 
(
    MAX(ClassName) 
    FOR ClassAndCapacity IN('+@cols+') 
) AS pvt' 

EXECUTE(@query) 

然後在我的情況下，我會刪除創建的表格：

DROP TABLE Flight 
DROP TABLE Class 
DROP TABLE FlightCapacity