1. What is the set of attributes that collectively identify an entity in an entity set known as?   Super Key   Foreign Key   Unique Key   None of these   Hint Half-n-half Clue   2. In the hierarchical database, the _______ can be located using the hashing function.   child nodes   primary key   root   None of these   Half-n-half Clue   3. Which company has developed the hierarchical model?   IBM   Oracle   Microsoft   Sun Microsystems   Half-n-half Clue   4. DBTG Codasyl is an example of _______ database.   relational   hierarchical   network   object - oriented   Half-n-half Clue   5. The domain in the relational model is said to be atomic if the elements of the domain consist of _______ units.   indivisible   divisible   redundant   distinct   Half-n-half Clue   6. In the Network data model, relationship between records is implemented using _______.   keys   pointers   parent-child relationship   None of these   Half-n-half Clue   7. In the Relational Model, each _______ contains values for the _______.   relation, entities   tuple, attributes   entity, domains   attribute, tuples   Half-n-half Clue