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DATABASE MANAGEMENT SYSTEMWhich key cannot be null - (i) Unique key - (ii) Primary key - (iii) Super key - (iv) Foreign key20237mDatabase 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 SystemFor relation: R(A,B,C); FDs={A \rightarrow B, B \rightarrow A}. Which statement is true? (i) A and B both are candidate keys (ii) Only A is key (iii) Only B is key (iv) Neither A nor B is key20252mDatabase Management SystemAn object in databases is equal to ____ + relationships. (i) data (ii) attribute (iii) entity (iv) constraint20192m
PreviousA relational database developer refers to a record as (i) a criterion (ii) a relation (iii) a tuple (iv) an attributeNextIt is better to use files than a DBMS when there are (i) stringent real-time requirements (ii) multiple users wish to access the data (iii) complex relationships among data (iv) All of the above
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