I am using SQL Server 2008 Enterprise. I want to add an identity column (as unique clustered index and primary key) to an existing table. Integer based auto-increasing by 1 identity column is ok. Any solutions?
BTW: my most confusion is for existing rows, how to automatically fill-in new identity column data?
thanks in advance,
George
Solution
you can use –
alter table <mytable> add ident INT IDENTITY
This adds ident column to your table and adds data starting from 1 and incrementing by 1.
To add clustered index –
CREATE CLUSTERED INDEX <indexName> on <mytable>(ident)
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