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DBI202 Final Exam |Questions with 100% Correct Answers
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DBI202 Final Exam |Questions with 100%Correct Answers
The degree of a relationship is ______
Select one:
a. The number of attributes in a relation
b. The number of tuples in a relation
c. The number of binary relationships
d. The number of entities involved with the relationship - ✔️✔️d
Which of the following statements is not DML?
Select one:
a. UPDATE
b. SELECT
c. DELETE
d. CREATE - ✔️✔️d
What is a right statement?
Select one:
a. It is a aggregation relationship
b. It is a association relationship
c. It is a composition relationship
d. It is a self-association relationship - ✔️✔️b
suppose that only accept price from 1 to 100 in relation Product( Id, name, price). What relation
algebra is used to express this constraint?
Select one:
,a. sprice>=1AND price<=100 (Product)=Æ
b. sprice<1 OR price>100 (Product)=Æ
c. sprice<1 OR sprice>100 (Product)=Æ
d. sprice<1 AND sprice>100 (Product)=Æ - ✔️✔️b
Consider a relation with schema R(A, B, C, D) and FD's A -> B, A -> C, C -> D. Which of the
following is the {A}+ ?
Select one:
a. {A,B}
b. {A,B,C,D}
c. {A}
d. {A,B,C} - ✔️✔️b
Which of the following is not the extended operator of relational algebra?
Select one:
a. Sorting operators
b. Duplicate-elimination operator d
c. Extended projection
d. Natural join operators - ✔️✔️d
What will be returned when the following SQL statement is executed?Select empSSN, count(*)
as num_projecsFrom tblWorksOnGroup By empSSN;
Select one:
a. A list of each employees as well as a number of projects that he or she has joined
b. None of the others
c. A list of all employees, sorted by empSSN
d. A count of all of the projects by all employees - ✔️✔️a
, Given a relation R(A,B,C,D). Which of the followings is trivial?
Select one:
a. A->->BCD
b. A->AB
c. A->BCD
d. A->->AB - ✔️✔️a
To declare a constraint that an employee is only male or female, we use _________
Select one:
a. Attribute-based CHECK constraint
b. Not-null constraint
c. Referenced integrity constraint
d. Tuple-based CHECK constraint - ✔️✔️a
Which of the followings is not available in relational data model?
Select one:
a. Data manipulation language
b. None of the others
c. Data definition language
d. Data controlling language - ✔️✔️b
Which of the following is NOT a standard aggregation operator?
Select one:
a. GROUP
b. SUM
c. AVG
d. COUNT - ✔️✔️a
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