Question

I have a table which have a row containing user emails and I want to add a constraint to make this row unique. The problem is that there are some (around 200) columns with empty values.

I need to generate dummy values and insert them to the empty columns.

How can I do it?

Thanks

Answer 1

Description

You can use the T-SQL function newid()

newid() Creates a unique value of type uniqueidentifier.

Sample

UPDATE MyTable set Column = newid() where Column is null

More Information

• MSDN – NEWID (Transact-SQL)