DBI202 EXAM QUESTIONS WITH ALL CORRECT ANSWERS (NEWEST VERSION)
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DBI202
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DBI202
DBI202 EXAM QUESTIONS WITH ALL CORRECT ANSWERS (NEWEST VERSION)
Which of the following is considered disadvantage of triggers?
A. Triggers run every time the database fields are Inserted/updated/deleted, so it adds overhead to system.
B. Triggers execute invisible to client application. It is...
DBI202 EXAM QUESTIONS WITH ALL
CORRECT ANSWERS (NEWEST
VERSION)
Which of the following is considered disadvantage of triggers?
A. Triggers run every time the database fields are Inserted/updated/deleted, so it adds
overhead to system.
B. Triggers execute invisible to client application. It is called by the database server
automatically, not by the client application or user.
C. All of the others
D. Unlike stored procedure, parameters cannot be used with triggers. - Answer ✔ b
The degree of a relationship is ____
A. The number of binary relationships
B. The number of attributes in a relation
C. The number of entities involved with the relationship
D. The number of tuples in a relation - Answer ✔ c
When performing union, intersection, or difference operations onRelations r and s, they
must be type compatible. That is, ____
A. R and s must have the same number of attributes
B. R and s must have the same number of attributes and the domain of corresponding
attributes of r and s must be compatible
C. The domain of corresponding attributes of r and s must be compatible
D. The names of attributes of r and s must be the same - Answer ✔ b
Which of the following expression is equivalent to the intersection of r and s:
A. R - s
B. R - (s - r)
C. R - (r - s)
D. S - (r - s) - Answer ✔ c
Choose the wrong statement
A. We should start the high level database design (for example, er diagram in
conceptual design) after getting user requirements.
B. All of the others
,C. The high level database design (for example, er diagram in Conceptual design)
depends on dbms selection
D. The high level database design (for example, er diagram in Conceptual design) is
independent of dbms selection. - Answer ✔ a
Which of the followings is incorrect?
A. In odl, an attribute is represented in the class declaration
B. In odl, attributes are only integers and strings
C. None of the others
D. In odl, a simplest kind of property is attribute - Answer ✔ b
With sql, how can you insert "trinh" as the "lastname" in the "persons" Table?
A. None of the others
B. Insert into persons ('trinh') into lastname
C. Insert ('trinh') into persons (lastname)
D. Insert into persons (lastname) values ('trinh') - Answer ✔ d
We should avoid redundancy when designing database because ____
A. We may encounter deletion anomalies
B. All of the others
C. We may encounter update anomalies
D. It wastes spaces - Answer ✔ a
____ is a language to access and manipulate data from a database. Even non-
programmers can use it to Retrieve and update data. Choose one Answer:
A. Php
B. Odbc
C. Structured query language
D. Asp - Answer ✔ c
A person's name, birthday, and social security number are all examples of : Choose one
Answer:
A. Entities
B. Relationships
C. Descriptors
D. Attributes - Answer ✔ d
A domain definition consists of the following components except: Choose one Answer:
A. Integrity constraints
B. Size
,C. Data type
D. Domain name - Answer ✔ a
Which of the following is software used to create, maintain, and provide controlled
access to databases? Choose one Answer:
A. Attribute
B. Network operating system
C. User view
D. Database management system - Answer ✔ d
In the sql language, the ____ statement is used to create table definitions. Choose one
Answer:
A. Select
B. Create session
C. Create index
D. Create table - Answer ✔ d
A database is an organized collection of ____ related data. Choose one Answer:
A. Physically
B. Loosely
C. Logically
D. Badly - Answer ✔ a
A join in which the joining condition is defined explicitly is called a(an): Choose one
Answer:
A. Cartesian product
B. Theta join
C. Natural join
D. All of the other choices - Answer ✔ b
Which of following feature is NOT responsibility of Database Management System?
A. Allow users to create new databases and specify their schemas
B. Give users the ability to query the data
C. Support the storage of very large amounts of data
D. Manage user accounts of computer on which DBMS is running - Answer ✔ d
Which of following statement is correct?
A. Every relation must have only one primary key
B. Primary key has only one attribute
, C. Two tuples can have the same values on primary key's components
D. Super key is a special primary key - Answer ✔ a
The database language that is used to query and modify the database is called ____:
A. Data Definition Language
B. Data Manipulation Language
C. Data Control Language
D. All of the others - Answer ✔ b
A rule that states that each foreign key value must match a primary key value in other
relation is called the ____
A. Referential integrity constraint
B. Key match rule
C. Foreign/primary match rule
D. Entity key group rule - Answer ✔ a
A constraint between two attribute sets in a relation is called ____
A. Functional relation
B. Attribute dependency
C. Functional dependency
D. Functional relation constraint - Answer ✔ c
Which of the following may be used to describe the relationship between two relations?
A. Super key
B. Alternate Key
C. Compose key
D. Foreign key - Answer ✔ d
The number of entity sets that participate in a relationship is called the ____
A Identifying characteristic
B. Degree
C. Entity
D. Entity set - Answer ✔ b
Suppose relation R(ABCD) with functional dependencies set F={AB, BC, BCD}. Which
of followings is a key of R?
A. A
B. B
C. AB
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