Need Help "for table per concreate class"

[sunil antil]

Hello Everyone,

I am just started learning Hibernate, please help me out to understand the concept "Table per concreate class", Till now what I understand is that we create table per concreate class and we do not have any table for super class.

What I am not able to understand, that polymorphic querries can not carried out using table per concreate class please tell me what are polymorphic querries?

And second Things which is not understand is foregin key is unable to represents polymorphic associations. Please explain me this concept in details because it does not give me any Idea

Thanks in Advance