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.

Contributor's Info

omkar nath @omkarnath 4 May 2017 03:30 am

Foreign key defination 

omkar nath @omkarnath 4 May 2017 03:31 am

Foregin key defination