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DBI 202 Exam Questions with 100% Correct Answers
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DBI 202 Exam Questions with 100% CorrectAnswers
A ____ is a collections of tables, views, triggers, and so on
A. Schema
B. Cluster
C. Catalog
D. None of the others - ✔️✔️a
What is a stored procedure in database?
A. A system relation
B. A temporary relation
C. A temporary object
D. None of the others - ✔️✔️d
Database management systems support following languages, EXCEPT
A. data definition language
B. data manipulation language
C. data controlling language
D. data securing language - ✔️✔️d
Authorizing access to database, coordinating, monitoring its use, acquiring software, and
hardware resources, ____ are responsibilities of
,A. database administrator
B. database designer
C. database programmer
D. database user - ✔️✔️a
All of followings are correct, EXCEPT
A. Super key is a key
B. Key is a super key
C. If X is a key, then any set of attributes consists of X is super key
D. Every relation has at least one key - ✔️✔️a
The description of data model consists of all followings, EXCEPT
A. structure of data
B. operations on data
C. constraints on data
D. privileges on data - ✔️✔️d
A set of (current) tuples for a given relation best describes
A. relation's schema
B. relation's instance
C. relation's content
D. relation's table - ✔️✔️b
Which SQL keyword is used to retrieve only unique values?
,A. DIFFERENT
B. DISTINCT
C. UNIQUE
D. UNION - ✔️✔️b
A trigger is ____
A. a special type of view
B. a special type of table
C. a special type of store procedure, executed when certain event occurs
D. Non of the others - ✔️✔️c
Functional dependency is
A. a constraint on two different relations
B. a constraint on a set of attributes of a relation
C. a constraint on two sets of attributes of a relation
D. a constraint on two sets of attributes of two different relations - ✔️✔️c
Subquery cannot be used in
A. FROM clause
B. WHERE clause
C. GROUP BY clause
D. HAVING clause - ✔️✔️c
, Given relation R(A,B), which of followings is valid?
A. SELECT A, B, COUNT(*) FROM R GROUP BY A
B. SELECT A, B, COUNT(*) FROM R GROUP BY A, B
C. SELECT A, COUNT(*) FROM R GROUP BY B
D. SELECT A, B, COUNT(*) FROM R GROUP BY B - ✔️✔️b
Given relation R(A, B) with attribute A (nullable) and B (not null), following queries are used to
count the tuples of R
A. SELECT COUNT(*) FROM R
B. SELECT COUNT(A) FROM R
C. SELECT COUNT(B) FROM R
D. A and C - ✔️✔️d
SQL triggers may be awakened by some events, EXCEPT
A. INSERT
B. UPDATE
C. DELETE
D. ALTER - ✔️✔️d
A trigger belongs to
A. a single table in the database
B. all tables in the database
C. more than one table in the database
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