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DATABASE MANAGEMENT SYSTEMDiscuss about different keys used in database design with examples20247mDatabase Management SystemWhat is a foreign key? (i) A foreign key is a primary key of a relation which is an attribute in another relation (ii) A foreign key is a superkey of a relation which is an attribute in more than one other relations (iii) A foreign key is an attribute of a relation that is a primary key of another relation (iv) A foreign key is the primary key of a relation that does not occur anywhere else in the schema20182mDATABASE MANAGEMENT SYSTEMWhich key cannot be null - (i) Unique key - (ii) Primary key - (iii) Super key - (iv) Foreign key20237mDatabase Management SystemKey to represent relationship between tables is called (i) primary key (ii) secondary key (iii) foreign key (iv) None of the above20202m
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