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UnPivot in SQL Server 2000

Posted on 2009-06-30
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897 Views
Last Modified: 2012-05-07
Hi,

I have the following table.


-- Create Cross Tab Table


CREATE TABLE #MyCrossTable
(
      BatchId int,    
      [Status-0] int,  
      [Status-1] int,  
      [Status-2] int,  
      [Status-3] int,  
      [Status-4] int
)
GO

INSERT INTO #MyCrossTable SELECT 1001, 0, 1, 1,  0, 0
GO

INSERT INTO #MyCrossTable SELECT 1002, 1, 0, 0,  1, 1
GO

INSERT INTO #MyCrossTable SELECT 1003, 0, 0, 0,  0, 1
GO

INSERT INTO #MyCrossTable SELECT 1004, 0, 0, 0,  0, 1
GO


I need to UnPivot this Cross Tab Table  to Normal Table as following (This is the sample template)


-- Create Normal Table


CREATE TABLE #MyTable
(
      BatchId int,
      Status int
)
GO

INSERT INTO #MyTable SELECT 1001, 1
GO

INSERT INTO #MyTable SELECT 1001, 2
GO

INSERT INTO #MyTable SELECT 1002, 0
GO

INSERT INTO #MyTable SELECT 1002, 3
GO

INSERT INTO #MyTable SELECT 1002, 4
GO

INSERT INTO #MyTable SELECT 1003, 4
GO

INSERT INTO #MyTable SELECT 1004, 4
GO

Can you please provide me the T-SQL code needed for this UnPivot ?

Thanks
0
Comment
Question by:milani_lucie
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7 Comments
 
LVL 60

Accepted Solution

by:
Kevin Cross earned 500 total points
ID: 24751189
Just use UNION statement:
SELECT BatchId, 0
FROM #MyCrossTable
WHERE [Status-0] = 1
UNION
SELECT BatchId, 1
FROM #MyCrossTable
WHERE [Status-1] = 1
UNION
SELECT BatchId, 2
FROM #MyCrossTable
WHERE [Status-2] = 1
UNION
SELECT BatchId, 3
FROM #MyCrossTable
WHERE [Status-3] = 1
UNION
SELECT BatchId, 4
FROM #MyCrossTable
WHERE [Status-4] = 1

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0
 

Author Comment

by:milani_lucie
ID: 24751210
mwvisa1:

Can you please explain this SQL in simple terms what you did ? This works really great ! Appreciate your time,  patience and great help !

Thanks
0
 
LVL 60

Expert Comment

by:Kevin Cross
ID: 24751249
This link my help, but I will give my own explanation as well:
http://www.w3schools.com/sql/sql_union.asp

The basic query is to take a batchid and a literal value representing the number of status if status column with the same number has a value of 1 as that indicates existence of that status in the crosstab query.

e.g.
SELECT BatchId, 4
FROM #MyCrossTable
WHERE [Status-4] = 1

This query will bring back only the batch id values that have a status 4.  

Using UNION, we can join multiple statements (one for each status possible) so that we ultimately get all the values vertically instead of horizontally.

It is late at night, but hopefully that was cohesive enough.

Best regards,
Kevin
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LVL 14

Expert Comment

by:Jagdish Devaku
ID: 24752163
hi,
Please check the below code... its working...
 
please let me know if there is any issue...

CREATE TABLE #MyCrossTable
(
      BatchId int,    
      [Status-0] int,   
      [Status-1] int,   
      [Status-2] int,   
      [Status-3] int,   
      [Status-4] int
)
GO
 
CREATE TABLE #MyTable 
(
      BatchId int,
	StatusName nvarchar(20),
      Status int
)
GO
 
 
INSERT INTO #MyCrossTable SELECT 1001, 0, 1, 1,  0, 0
GO
 
INSERT INTO #MyCrossTable SELECT 1002, 1, 0, 0,  1, 1
GO
 
INSERT INTO #MyCrossTable SELECT 1003, 0, 0, 0,  0, 1
GO
 
INSERT INTO #MyCrossTable SELECT 1004, 0, 0, 0,  0, 1
GO
 
 
 
insert into #MyTable
SELECT batchid, StatusName, status
FROM (select batchid, [status-0],[status-1],[status-2],[status-3],[status-4] from #MyCrossTable)p
UNPIVOT
(status for StatusName in ( [status-0],[status-1],[status-2],[status-3],[status-4])) as unpvt
where status = 1
go
 
update #MyTable
set Status = 0
where StatusName = 'status-0'
 
update #MyTable
set Status = 1
where StatusName = 'status-1'
 
update #MyTable
set Status = 2
where StatusName = 'status-2'
 
update #MyTable
set Status = 3
where StatusName = 'status-3'
 
update #MyTable
set Status = 4
where StatusName = 'status-4'
go
 
select batchid, status from #MyTable
 
DROP table #MyCrossTable
 
DROP table #MyTable
go

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0
 
LVL 14

Expert Comment

by:Jagdish Devaku
ID: 24752172
in the above query i have added 'statusname' column in #Mytable for reference...
0
 
LVL 60

Expert Comment

by:Kevin Cross
ID: 24753804
UNPIVOT and PIVOT are SQL 2005+.  UNION is more portable and is only one statement as you can just add INSERT INTO line above it to populate the #MyTable.
0
 
LVL 60

Expert Comment

by:Kevin Cross
ID: 24755001
If the title is incorrect and this is for SQL Server 2005, then you avoid the multiple updates by converting the UNPIVOT query to the following:
SELECT batchid, cast(right(StatusName, charindex('-', reverse(StatusName))-1) as INT) as [status]
FROM (select batchid, [status-0],[status-1],[status-2],[status-3],[status-4] from #MyCrossTable)p
UNPIVOT
(status for StatusName in ( [status-0],[status-1],[status-2],[status-3],[status-4])) as unpvt
where status = 1

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