EF TPT Inheritance: one DbSet per child?

Question

In the MSDN they show how to implement EF TPT with this example:

    public abstract class BillingDetail
    {
        public int BillingDetailId { get; set; }
        public string Owner { get; set; }
        public string Number { get; set; }
    }

    [Table("BankAccounts")]
    public class BankAccount : BillingDetail
    {
        public string BankName { get; set; }
        public string Swift { get; set; }
    }

    [Table("CreditCards")]
    public class CreditCard : BillingDetail
    {
        public int CardType { get; set; }
        public string ExpiryMonth { get; set; }
        public string ExpiryYear { get; set; }
    }

    public class InheritanceMappingContext : DbContext
    {
        public DbSet<BillingDetail> BillingDetails { get; set; }
    }

Regarding (*) I have this question:

Can I have a DbSet per child in the hierarchy? ie:

    public class InheritanceMappingContext : DbContext
    {
        public DbSet<BankAccount> BankAccount { get; set; }
        public DbSet<CreditCard> CreditCards{ get; set; }
    }

I'm asking this because I'd like to have a main father class from which all the other classes inherit, ie:

    public abstract class DatabaseItem
    {
        [Key]
        public long DatabaseItemId { get; set; }
    }

    public User : DatabaseItem
    {
        ...
    }

    public Picture : DatabaseItem
    {
        ...
    }

    public Gallery : DatabaseItem
    {
        ...
    }

So that given an ID, I know that it corresponds to only one thing.
In the past in other projects I didnt do this, and used specifical IDs: "UserId", "PictureId", "GalleryId".

In this case, I will be having only one DbSet?

   DbSet<DatabaseItem> DatabaseItems