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SQL Query Request

Posted on 2010-08-27
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Last Modified: 2012-05-10
How do you populate an integer field with its row number.  I am interested in a query that populates a field with its row number.
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Question by:dastaub
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LVL 23

Expert Comment

by:Rajkumar Gs
ID: 33546468
Use ROW_NUMBER()

SELECT ID, ROW_NUMBER() OVER(ORDER BY ID) ROWNO
FROM YourTable

RowNumber will be created based on the order by column. Here I have given 'ID' as primary key field.

Raj
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Author Comment

by:dastaub
ID: 33546491
i was expecting an update query?
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LVL 44

Expert Comment

by:pcelba
ID: 33546517
You may populate the column immediately when you are adding it:

ALTER TABLE YourTable ADD YourNewColumn int identity(1,1)
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LVL 23

Expert Comment

by:Rajkumar Gs
ID: 33546520
See the attached scripts.
Raj
create table #table
(
	id int
)

insert into #table select 1 union select 4 union select 9

select * from #table

-- update query
update t
	set id = r.rowno
from #table t
	inner join 
(
	select id, row_number() over(order by id) rowno
	from #table
) r on t.id = r.id

select * from #table

drop table #table

Open in new window

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LVL 44

Accepted Solution

by:
pcelba earned 2000 total points
ID: 33546546
If the column exists already then you may do it same way and then update the existing column and drop the identity column:

ALTER TABLE YourTable ADD YourNewColumn int identity(1,1)
GO
UPDATE YourTable SET YourOldIntColumn = YourNewColumn
GO
ALTER TABLE YourTable DROP COLUMN YourNewColumn
GO

The Update with ROW_NUMBER is also possible.
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Author Closing Comment

by:dastaub
ID: 33546837
I was not aware that inserting the record number was involved, so i went with an identity column.
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