in reply to
Re^2: OO concepts and relational databases
in thread OO concepts and relational databases
Supposing you have a table Vehicle, you might need tables Truck and Motorcycle to hold information specific to only some of the rows in Vehicle.
You're describing here a design rule able to emulate an heritage, which is mostly a matter of methodology/dba experience.
With a (real) OODBMS, this kind of
trickery relational modelisation is not required.
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If the only tool you have is a hammer, you will see every problem as a nail. --Abraham Maslow
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