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Inheritance is supported by... (Score:1)
Re: (Score:2)
... sucking up to your rich uncle.
Where there's a will, there's a relative.
Seriously, the book was suggesting using other tables for subclasses and foreign key constraints against the original table. This, however, can lead to very clumsy code, though in practice, this is what is generally done. What if you want to save changes to a class? You class code needs to keep track of all tables which are affected and update them accordingly. I've done this and it can get quite complicated.
That being sai