如何将多行数据合并为一个？

Question

我使用SQL Server 2008中我有数据如下表：

Team Email    Groups 
------- ------------------ ------ 
|Team1|-|email0@email.com|-|A| 
|Team1|-|email1@email.com|-|B| 
|Team1|-|email2@email.com|-|C| 
|Team2|-|email3@email.com|-|A| 
|Team2|-|email4@email.com|-|B| 
|Team2|-|email5@email.com|-|C| 

我想在这种格式的数据：

Team A     B     C 
------- ------------------ ------------------ ------------------ 
|Team1|-|email0@email.com|-|email1@email.com|-|email2@email.com| 
|Team2|-|email3@email.com|-|email4@email.com|-|email5@email.com| 

我怎样才能做到这一点？

Answer 1

使用PIVOT你可以做以下

With SampleData AS 
(
SELECT 'Team1' as Team , 'email0@email.com' as email, 'A' as Groups 
UNION SELECT 'Team1' as Team , 'email1@email.com' as email, 'B' as Groups 
UNION SELECT 'Team1' as Team , 'email2@email.com' as email, 'C' as Groups 
UNION SELECT 'Team2' as Team , 'email3@email.com' as email, 'A' as Groups 
UNION SELECT 'Team2' as Team , 'email4@email.com' as email, 'B' as Groups 
UNION SELECT 'Team2' as Team , 'email5@email.com' as email, 'C' as Groups 
) 
SELECT Team, A, B,C FROM 
(SELECT * FROM SampleData) source 
PIVOT 
(MAX(email) FOR Groups IN ([A], [B], [C]))as pvt 

主要生产

Team A    B    C 
----- ---------------- ---------------- ---------------- 
Team1 email0@email.com email1@email.com email2@email.com 
Team2 email3@email.com email4@email.com email5@email.com 

见工作Data.SE example

在DB不支持旋转，则可以改为做多的加入到你的桌子。尽管您可能想要，但正如GBN指出的那样，因为我们没有使用聚合。

With SampleData AS 
(
SELECT 'Team1' as Team , 'email0@email.com' as email, 'A' as Groups 
UNION SELECT 'Team1' as Team , 'email1@email.com' as email, 'B' as Groups 
UNION SELECT 'Team1' as Team , 'email2@email.com' as email, 'C' as Groups 
UNION SELECT 'Team2' as Team , 'email3@email.com' as email, 'A' as Groups 
UNION SELECT 'Team2' as Team , 'email4@email.com' as email, 'B' as Groups 
UNION SELECT 'Team2' as Team , 'email5@email.com' as email, 'C' as Groups 
) 

SELECT 
    source.Team, 
    A.email, 
    B.email, 
    C.email 
FROM 
    (SELECT DISTINCT TEAM From SampleData) source 
    LEFT JOIN SampleData A 
    ON source.Team = A.Team 
    AND A.GROUPS = 'A' 
    LEFT JOIN SampleData B 
    ON source.Team = B.Team 
    AND B.GROUPS = 'B' 
    LEFT JOIN SampleData C 
    ON source.Team = C.Team 
    AND C.GROUPS = 'C' 

见工作Data.SE example