How to implement SubType/SuperType in Oracle ?

Hi,
I have a supertype and three subtypes, as attached below, how is the
best approach to implement it in Oracle (9i/10g) ?
Thank you for your help,
Krist
Supertype : Employee
Employee_Number
Employee_Name
Address
Employee_Type
Date_Hired
SubType : Hourly_Employee
Hourly_Rate
SubType : Salaried_Employee
Annual_Salary
Stock_Options
SubType : CONSULTANT
Contract_Number
Billing_Rate

Assuming you want to model this relationally, try something like this.
http://groups-beta.google.com/group/comp.databases.oracle.server/msg/a23ffb19bfde2f20?hl=en
Note its a generic SQL approach, and somewhat over fussy but I think the genral approach holds up for this type of relationship.
I would sort of stay away from objects in the database, it over complicates everything else you will ever do.

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How to implement SubType/SuperType in Oracle ?

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