Question

Foreign key can not be used to refers to its own relation????

Comments

No, foreign key even refers it's own relation too

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How.  Can u give me example

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lines from wiki

 the child and parent table may, in fact, be the same table, i.e. the foreign key refers back to the same table. Such a foreign key is known in SQL:2003 as a self-referencing or recursive foreign key. ... A table may have multiple foreign keys, and each foreign key can have a different parent table

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Employee(eid,name,Mid), Mid is a F.K. reference eid of Employee

 

it is just like self-referential structures ( linked list ) in C language