Foreign Key

A foreign Key is an attribute or (combination of more than one attribute) of a relation (Table) that is the primary key of another relation (Table ). In other words, If we had a table A with a primary key P that linked to a table B where P was a field in B, then X would be a foreign key in B.
So, Foreign key is the set of attribute used to reference primary key and alternate key of the same table or some other table.

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omkar nath @omkarnath 4 May 2017 03:30 am

Foreign key defination 

omkar nath @omkarnath 4 May 2017 03:31 am

Foregin key defination