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DBI 202 Exam Questions with 100% Correct Answers
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DBI 202 Exam Questions with 100% Correct Answers
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DBI 202 Exam Questions with 100%Correct Answers
A ____ is a notation for describing the structure of the data in a database, along with the
constraints on that data
A. data model
B. database management system
C. data operation
D. data manipulation - ✔ ✔ a
A ____ is a language for defining data structures
A. DDL
B. DML
C. DCL
D. None of the others - ✔ ✔ a
Which statement is used to remove a relation named R?
A. DROP TABLE R;
B. REMOVE TABLE R;
C. DELETE TABLE R;
D. TRUNCATE TABLE R; - ✔ ✔ a
,What is another term for a row in a relational table?
A. Attribute
B. Tuple
C. Field
D. Relation - ✔ ✔ b
Given a relation R(A,B,C,D). Which of the followings is trivial?
A. A->AB
B. A->->AB
C. A->BCD
D. A->->BCD - ✔ ✔ d
Let R(ABCD) be a relation with functional dependencies
{A -> B,
C -> B,
B->D}
What is the key for R (choose one)
A. AB
B. AC
C. AD
D. BD - ✔ ✔ b
Suppose R is a relation with attributes A1, A2, A3, A4.
The only key of R is {A1, A2}. So, how many super-keys do R have?
,A. 4
B. 8
C. 12
D. 16 - ✔ ✔ a
Consider the following functional dependencies
a,b -> c,d e,g,h -> f,j
a,c -> b,d p,q -> r,s
e,f,g -> h,i s -> t
f,g -> j q -> u
g,h -> i
Which of the following best describes the relation R(e,f,g,h,i,j)?
A. R is in First Normal Form
B. R is in Second Normal Form
C. R is in Third Normal Form
D. R is in Boyce Codd Normal Form - ✔ ✔ a
The relation R(ABCD) has following FDs:
{A->B;B->A;A->D;D->B}
A. R is in 3NF
B. R is not in 3NF
C. R is not in 2NF
D. None of the others - ✔ ✔ a
, Given a R(A,B,C,D) with the following FDs:
AB->D
BC->A
AD->B
CD->B
AD->C
Choose a correct statement about R:
A. The FD set of R is not canonical and R is in BCNF
B. The FD set of R is canonical and R is not in BCNF
C. The FD set of R is not canonical and R is not in BCNF - ✔ ✔ a
What is the difference between the 2NF and the 3NF?
A. 2NF deals with partial functional dependency, while 3NF deals with transitive
functional dependency
B. 2NF deals with transitive functional dependency, while 3NF deals with partial
functional dependency - ✔ ✔ a
What is "de-normalization"?
A. De-normalization means allowing redundancy in a table
B. De-normalization means allowing duplicate columns appeared in a table C.
De-normalization means allowing a table to have more than 3 columns
D. De-normalization means allowing a table to have more than 1024 columns - ✔ ✔ a
What is the benefit of "de-normalization"?
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