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Justify your answer in two lines for each question. i) Is it mandatory for a foreign key to be a primary key in another table?
Justify your answer in two lines for each question. i) Is it mandatory for a foreign key to be a primary key in another table? Why? ii) Can foreign keys be null values in the child relation? iii) Can foreign keys have duplicate values? iv) Can there exist more than one foreign key in a relation? v) Can primary key values only be in integer type
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