Inheritance in database?

Question

Is there any way to use inheritance in database (Specifically in SQL Server 2005)?

Suppose I have few field like CreatedOn, CreatedBy

Answer 1

in O-R mapping, inheritance maps to a parent table where the parent and child tables use the same identifier

for example

create table Object (
    Id int NOT NULL --primary key, auto-increment
    Name varchar(32)
)
create table SubObject (
    Id int NOT NULL  --primary key and also foreign key to Object
    Description varchar(32)
)

SubObject has a foreign-key relationship to Object. when you create a SubObject row, you must first create an Object row and use the Id in both rows