make record unique in sql server 2012
Posted on 2012-03-26
In SQL server 2012, how do you make the record unique (something like in Access : Indexed - No duplicates) ? I click on the table - select design - but I am unsure what to do next.
Now, field is nvarchar(5) type .. How do you index it so no duplicates are allowed? uniqueidentifier ? what does AllowNull stand for ? user must enter a value i.e field cant be empty?
Since I imported my table from access, I used to have ID autoinc field. Now in server it says its an int. is it still an autoinc field or something else ?