Question

I have a question about unique fields in a SQL Server database.

I have a already existing database with an index and some foreign keys and so on.
Now I need to set one column e.g. name, to be UNIQUE.

How to do this?

Answer 1

ALTER TABLE yourtable
ADD CONSTRAINT
    ix_uniquename UNIQUE NONCLUSTERED 
    (
       name
    ) 
WITH( STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]

or view the design of the table, right click and select Indexes/Keys