DBMS Keys Questions And Answers

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DBMS Keys Questions and Answers

1. Which one of the following is a set of one or more attributes taken collectively to uniquely identify a record?

DBMS Keys Questions and Answers

2. Consider attributes ID , CITY and NAME . Which one of this can be considered as a super key ?

DBMS Keys Questions and Answers

3. The subset of super key is a candidate key under what condition ?

DBMS Keys Questions and Answers

4. A _____ is a property of the entire relation, rather than of the individual tuples in which each tuple is unique.

DBMS Keys Questions and Answers

5. Which one of the following attribute can be taken as a primary key ?

DBMS Keys Questions and Answers

6. Which one of the following cannot be taken as a primary key ?

DBMS Keys Questions and Answers

7. A attribute in a relation is a foreign key if the _______ key from one relation is used as an attribute in that relation .

DBMS Keys Questions and Answers

8. The relation with the attribute which is the primary key is referenced in another relation. The relation which has the attribute as primary key is called

DBMS Keys Questions and Answers

9. The ______ is the one in which the primary key of one relation is used as a normal attribute in another relation .

DBMS Keys Questions and Answers

10. A _________ integrity constraint requires that the values appearing in specified attributes of any tuple in the referencing relation also appear in specified attributes of at least one tuple in the referenced relation.