I am transforming data from this legacy table: Phones(ID int, PhoneNumber, IsCell bit, IsDeskPhone bit, IsPager bit, IsFax bit)
These bit fields are not nullables and, potentially, all four bit fields can be 1.
How can I unpivot this thing so that I end up with a separate row for each bit field = 1. For instance, if the original table looks like this...
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
... I want the result to be the following:
ID PhoneNumber Type
-----------------------
1 123-4567 Cell
1 123-4567 Pager
2 123-6567 Desk
3 123-7567 Fax
4 123-8567 Desk
Thanks!
The syntax for the UNPIVOT operator is similar to the PIVOT one. In the SELECT statement, you need to specify the columns you want to add to the output table. In the UNPIVOT statement, you will specify two columns: The first column contains the values from the rows of the pivoted columns (which is Score in this case).
UNPIVOT is a relational operator that accepts two columns (from a table or subquery), along with a list of columns, and generates a row for each column specified in the list. In a query, it is specified in the FROM clause after the table name or subquery.
Conventionally we can say that Pivot operator converts the rows data of the table into the column data. The Unpivot operator does the opposite that is it transform the column based data into rows.
Unpivot only selected columns Select the columns you do want to unpivot. To select more than one column contiguously or discontiguously, press Shift+Click or CTRL+Click on each subsequent column. Select Transform > Unpivot Only Selected Columns.
2005/2008 version
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
see also Column To Row (UNPIVOT)
Try this:
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
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