What create when a primary key combined with a foreign key, Database Management System

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What will be create when a primary key if combined with a foreign key?

A primary key if combined with a foreign key it creates Parent-Child relationship between the tables that connect them.

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Haw does it work one database application

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Unnormalize form, employee(empid,empname,dept,telno,mobno, add,sssno,tinno,...

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