If I want the DB to generate a column value, I have choices:
        
        A) I can create an Identity column, I can tell teh DB what value to start with
            how to increment the value
            
            ORDER_NUMBER int not null primary key, <- this is NOT generted by the DB
            BILLING_ID int generated as IDENTITY not null primary key, <- this is Auto-generated
            
        B) I can create a Sequence Objects and us that object for the column
            a Sequence Object could be used for more that 1 table