what is foreign keya relation schema r1 derived
What is foreign key?
A relation schema r1 derived from an ER schema may contain among its attributes the primary key of another relation schema r2.this attribute is known as a foreign key from r1 referencing r2.
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write short notes on schema diagrama database schema along with primary key and foreign key dependencies can be depicted pictorially by schema
q what is the clitellum of earthtworms and where it is locatedthe clitellum is a special region of the annelid constituted by rings metameres with
what is foreign keya relation schema r1 derived from an er schema may contain among its attributes the primary key of another relation schema r2this
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