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Database 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 SYSTEMThe relational model feature is that there - (i) is no need for primary key data (ii) is much more data independence than some other database models (iii) are explicit relationships among records (iv) are tables with many dimensions20212mDatabase Management SystemWith example discuss candidate key, super key, primary key and foreign key.20227mDatabase 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