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 change a varchar column to int identity(1,1)		  New Topic  Reply to Topic
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learning_grsql
Posting Yak Master

155 Posts
Posted - 01/28/2013 :  03:44:00  Show Profile  Reply with Quote
I have a column with datatype varchar(20) and I would like to change the data type to int identity(1,1).

I tried the code below but it shows error near identity(1,1).


alter table mytable
alter column userid int identity(1,1) not null

bandi
Flowing Fount of Yak Knowledge

India
1390 Posts
Posted - 01/28/2013 :  04:02:40  Show Profile  Reply with Quote
Check this link.. there are two methods to achieve this alteration...

http://social.msdn.microsoft.com/forums/en-US/transactsql/thread/04d69ee6-d4f5-4f8f-a115-d89f7bcbc032

--
Chandu
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visakh16
Very Important crosS Applying yaK Herder

India
47023 Posts
Posted - 01/28/2013 :  04:05:50  Show Profile  Reply with Quote
you cant directly modify an existing column to be of type identity. you can use below workaround

http://www.mssqltips.com/sqlservertip/1397/add-or-drop-identity-property-for-an-existing-sql-server-column/

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SQL Server MVP
http://visakhm.blogspot.com/
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