MYSQL MCQ's SET-4
61. For the given set of functional dependency F, it’s closure is denoted as
A : F+
B : F
C : F*
D : F_
Ans: A
62. What do you mean by one to many relationship between Teacher and Class table?
A : One class may have many teachers
B : One teacher can have many classes
C : One teacher can have one class
D : Many teachers may have many classes
Ans: B
63. Data redundancy may lead to:
A : Data integrity
B : Atomicity problem
C : Data inconsistency
D : Data abstraction
Ans: C
64. Which one of the following uniquely identifies the elements in the relation?
A : Primary key
B : Secondary Key
C : Foreign key
D : Composite key
Ans: A
65. The conceptual model is_________.
A : Dependent on hardware
B : Dependent on software.
C : Dependent on both hardware and software
D : Independent of both hardware and software
Ans: D
66. All aggregate functions except _____ ignore null values in their input collection.
A : Count(attribute)
B : Count(*)
C : Avg
D : Sum
Ans: B
67. The database environment has all of the following components except________
A : Users.
B : Separate files
C : Database.
D : Database administrator
Ans: B
68. In which state one gathers and list all the necessary fields for the database design project.
A : Data Definition
B : Data Refinement
C : Establishing Relationship
D : Data deletion
Ans: A
69. This key that uniquely identifies each record is called
A : Primary Key
B : Key Record
C : Unique Key
D : Field Name
Ans: A
70. Hierarchical model is also called_________.
A : Tree structure
B : Plex Structure
C : Normalize Structure
D : Table Structure
Ans: A
71. In an Entity-Relationship Diagram “Diamonds” represents__________________
A : Attributes
B : Multi-valued attributes
C : Weak entity set
D : Relationship sets
Ans: D
72. Which of the following attribute can be further divided into subparts
A : Simple attribute
B : Multivalued attribute
C : Composite attribute
D : Derived attribute
Ans: C
73. Who is more concerned about the conceptual level of the DBMS
A : The Systems programmer
B : The end user
C : Client
D : DBA
Ans: D
74. Which of the following is the structure of the Database?
A : Table
B : . Schema
C : Relation
D : Structure
Ans: B
75. The users who use easy-to-use menu are called
A : Sophisticated end users
B : Naïve users
C : Stand-alone users
D : Casual end user
Ans: B
76. A data dictionary is a repository that manages _____
A : Memory
B : Metadata
C : Spell Checker
D : Data Validator
Ans: B
77. E-R model uses this symbol to represent weak entity set ?
A : Dotted rectangle
B : Diamond
C : Doubly outlined rectangle
D : Dotted diamond
Ans: C
78. In E-R diagram generalization is represented by
A : Ellipse
B : Dashed ellipse
C : Rectangle
D : Triangle
Ans: D
79. In SQL ‘relation A contains relation B’ can be written as
A : Not exists B except A
B : exists B except A
C : Not exists A except B
D : exists A except B
Ans: A
80. In E-R Diagram derived attribute are represented by________.
A : Ellipse
B : Dashed ellipse
C : Rectangle
D : Triangle
Ans: B
