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can we have one or more foreign key in one table.

Yes you can! But each foreign key constraint would go in its own field. A join-table is a good example of a table that, in most cases, only has foreign keys. This is how many-to-many relations are created (in relational database ).

Good luck!
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see the following for examples:[^]

create table A
id int constraint PK_D primary key,
idb int constraint FK_D_IDB foreign key references B(id),
idc int constraint FK_D_IDC foreign key references C(id),
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