TSQL - UNPIVOT的帮助

Question

我正在转换这个遗留表中的数据：

Phones(ID int, PhoneNumber, IsCell bit, IsDeskPhone bit, IsPager bit, IsFax bit)

这些位字段不是空的，而且，潜在地，所有四个位字段都可以是1。

如何才能解除这个问题，使我在每一个位字段= 1上都有一个单独的行。例如，如果原来的桌子是这样的.

ID, PhoneNumber, IsCell, IsPager, IsDeskPhone, IsFax
----------------------------------------------------
1   123-4567     1       1        0            0
2   123-6567     0       0        1            0
3   123-7567     0       0        0            1
4   123-8567     0       0        1            0

..。我希望结果如下：

ID   PhoneNumber   Type
-----------------------
1    123-4567      Cell
1    123-4567      Pager
2    123-6567      Desk
3    123-7567      Fax
4    123-8567      Desk

谢谢!

Answer 1

2005/2008版

SELECT ID, PhoneNumber, Type
FROM
(SELECT ID, PhoneNumber,IsCell, IsPager, IsDeskPhone, IsFax
 FROM Phones) t
UNPIVOT
( quantity FOR Type  IN
    (IsCell, IsPager, IsDeskPhone, IsFax)
) AS u
where quantity = 1

另见至行栏(UNPIVOT)

Answer 2

试试这个：

DROP TABLE #Phones
CREATE TABLE #Phones
(
    Id int,
    PhoneNumber varchar(50),
    IsCell bit,
    IsPager bit,
    IsDeskPhone bit,
    IsFax bit
)

INSERT INTO #Phones VALUES (1, '123-4567', 1, 1, 0, 0)
INSERT INTO #Phones VALUES (2, '123-6567', 0, 0, 1, 0)
INSERT INTO #Phones VALUES (3, '123-7567', 0, 0, 0, 1)
INSERT INTO #Phones VALUES (4, '123-8567', 0, 0, 1, 0)

SELECT Id, PhoneNumber, [Type]
FROM (
    SELECT  Id, PhoneNumber, 
            Cell = IsCell, Pager = IsPager, 
            Desk = IsDeskPhone, Fax = IsFax
    FROM #Phones
) a 
UNPIVOT(
    something FOR [Type] IN (Cell, Pager, Desk, Fax )
) as upvt