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How to convert data in table as column from a table appling self join or some other logic.

Posted on 2013-01-18
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Last Modified: 2013-01-18
I have the data in rows where in on the basis of those values i want to convert them into column.
The sample data and desired output is attached.
Sample-data.xlsx
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Question by:searchsanjaysharma
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4 Comments
 
LVL 35

Expert Comment

by:David Todd
ID: 38795687
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LVL 35

Accepted Solution

by:
David Todd earned 500 total points
ID: 38795711
Hi,

I used the Union All to eliminate the difference between the delivered subject and the attended subject.

use ExpertsExchange
go

if exists(
	select *
	from sys.objects
	where
		object_id = object_id( N'dbo.SomeData' )
		and type in( N'U' )
	)
	drop table dbo.SomeData
;
go

if not exists(
	select *
	from sys.objects
	where
		object_id = object_id( N'dbo.SomeData' )
		and type in( N'U' )
	)
	create table dbo.SomeData (
		UID int
		, Subject varchar( 10 )
		, Attended int
		, Delivered int
	) on [PRIMARY]
go

insert dbo.SomeData( UID, Subject, Attended, Delivered )
	values( 101, 'SC-101', 	1,	4 )
	, ( 102, 	'SC-101',	2,	4 )
	, ( 103, 	'SC-101',	3,	4 )
	, ( 104, 	'SC-101',	4,	4 )
	, ( 105, 	'SC-101',	3,	6 )
	, ( 101, 	'SC-102',	4,	6 )
	, ( 102, 	'SC-102',	2,	6 )
	, ( 103, 	'SC-102',	6,	6 )
	, ( 104, 	'SC-102',	5,	6 )
	, ( 105, 	'SC-102',	4,	6 )
	, ( 101, 	'SC-103',	1,	3 )
	, ( 102, 	'SC-103',	1,	3 )
	, ( 103, 	'SC-103',	2,	3 )
	, ( 104, 	'SC-103',	3,	3 )
	, ( 105, 	'SC-103',	2,	3 )
	, ( 101, 	'SC-101',	1,	2 )
	, ( 102, 	'SC-101',	0,	2 )
	, ( 103, 	'SC-101',	1,	2 )
	, ( 104, 	'SC-101',	1,	2 )
	, ( 105, 	'SC-101',	1,	2 )
	, ( 101, 	'SC-102',	1,	3 )
	, ( 102, 	'SC-102',	2,	3 )
	, ( 103, 	'SC-102',	1,	3 )
	, ( 104, 	'SC-102',	2,	3 )
	, ( 105, 	'SC-102',	1,	3 )
	, ( 101, 	'SC-103',	0,	1 )
	, ( 102, 	'SC-103',	0,	1 )
	, ( 103, 	'SC-103',	1,	1 )
	, ( 104, 	'SC-103',	1,	1 )
	, ( 105,	'SC-103',	0,	1 )
;

select *
from dbo.SomeData
;

select
	UID
	, Subject + ' (Attended)' as Subject
	, Attended as Attendance
from dbo.SomeData

union all

select
	UID
	, Subject + ' (Delivered)' as Subject
	, Delivered as Attendance
from dbo.SomeData
;

select 
	UID
	, [SC-101 (Attended)]
	, [SC-101 (Delivered)]
	, [SC-102 (Attended)]
	, [SC-102 (Delivered)]
	, [SC-103 (Attended)]
	, [SC-103 (Delivered)]
from (
	select
		UID
		, Subject + ' (Attended)' as Subject
		, Attended as Attendance
	from dbo.SomeData

	union all

	select
		UID
		, Subject + ' (Delivered)' as Subject
		, Delivered as Attendance
	from dbo.SomeData
) p
pivot (
	sum( Attendance )
	for Subject in ( [SC-101 (Attended)], [SC-101 (Delivered)], [SC-102 (Attended)], [SC-102 (Delivered)], [SC-103 (Attended)], [SC-103 (Delivered)] )
	) as pvt
order by
	UID
;

Open in new window


HTH
  David

PS I have a database I keep as a testbed called ExpertsExchange (grin)
0
 

Author Comment

by:searchsanjaysharma
ID: 38795782
This i can achieve using group by also. i want to convert those into columns.
0
 

Author Closing Comment

by:searchsanjaysharma
ID: 38795784
Tx
0

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