How we generate Surrogate Keys without using identify column

Hi All,
How we generate Surrogate Keys without using identify column.
Regards,
Manish

There are various options
1.IDENTITY columns - simplest to implement
2. Using NEWID(), NEWSEQUENTIALID() functions (if you want to use GUID values as surrogate keys)
3. SEQUENCE object (if SQL 2012 and above)
4. Using custom functions to generate keys yourself
This is an good article which compares use of GUIDs against integers as surrogate keys
http://blog.jonathanoliver.com/integers-vs-guids-and-natural-vs-surrogate-keys/
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