Data Types and Structures: A Comprehensive Guide for Database Management

Question 1

In SQL, which data type is specifically used for storing whole numbers?

Accepted Answer

INT

Answer

FLOAT

Answer

VARCHAR

Answer

DATETIME

Question 2

Which of the following is **not** a primitive data type in a relational database management system?

Accepted Answer

Array

Answer

Integer

Answer

String

Answer

Date

Question 3

In a database, which data type is used to store integer values?

Accepted Answer

Integer (INT)

Answer

Floating-point number (FLOAT)

Answer

Variable-length string (VARCHAR)

Answer

Boolean (BOOLEAN)

Question 4

Which data structure is suitable for storing data in a hierarchical manner?

Accepted Answer

Tree

Answer

Array

Answer

List

Answer

Queue

Question 5

What is a key advantage of using linked lists as a data structure?

Accepted Answer

Efficient insertion and deletion

Answer

Optimal memory usage

Answer

Random access to elements

Answer

Ease of implementation

Question 6

In a database, what is the primary purpose of a primary key constraint?

Accepted Answer

Ensuring unique rows

Answer

Maintaining referential integrity

Answer

Enhancing query performance

Answer

Preventing duplicate data entries

Question 7

In a database, what is the function of an index?

Accepted Answer

Accelerating data retrieval

Answer

Enforcing data validity

Answer

Storing database metadata

Answer

Preventing duplicate data entries

Question 8

Which of the following is a potential drawback of database normalization?

Accepted Answer

Introducing unnecessary database complexity

Answer

Eliminating data redundancy

Answer

Improving data integrity

Answer

Facilitating efficient data retrieval

Question 9

Which of the following is NOT a primitive data type in SQL?

Accepted Answer

ARRAY

Answer

INTEGER

Answer

STRING

Answer

BOOLEAN

Question 10

Which data structure is used to store data in a hierarchical manner?

Accepted Answer

Tree

Answer

Array

Answer

Linked list

Answer

Hash table

Question 11

What is the purpose of a foreign key constraint?

Accepted Answer

To enforce data integrity

Answer

To establish a relationship between two tables

Answer

To prevent data duplication

Answer

To optimize query performance

Question 12

What is the main purpose of a trigger in a database system?

Accepted Answer

To automatically execute a set of actions when a specific event occurs

Answer

To enhance data security

Answer

To improve data integrity

Answer

To optimize query performance

Question 13

What is the primary purpose of a primary key in a database table?

Accepted Answer

To uniquely identify each row

Answer

To sort the table in ascending order

Answer

To enforce data integrity

Answer

To store the largest value in the table

Question 14

Which data structure is used for hierarchical data storage?

Accepted Answer

Tree

Answer

Array

Answer

Graph

Answer

Linked list

Question 15

What is the key difference between VARCHAR and CHAR data types?

Accepted Answer

CHAR has a fixed length, while VARCHAR has a variable length

Answer

VARCHAR has a fixed length, while CHAR has a variable length

Answer

VARCHAR and CHAR have identical properties

Answer

VARCHAR is for strings, while CHAR is for numbers

Question 16

Which SQL command is used to add a new row to a database table?

Accepted Answer

INSERT

Answer

ADD

Answer

APPEND

Answer

CREATE

Question 17

What is the purpose of a foreign key in a database relationship?

Accepted Answer

To enforce referential integrity

Answer

To create a new table

Answer

To delete related rows

Answer

To update related rows

Question 18

What is the distinction between a clustered and a non-clustered index?

Accepted Answer

Clustered index resides with table data, while non-clustered index is stored separately

Answer

Non-clustered index resides with table data, while clustered index is stored separately

Answer

Clustered index can only be created on one column, while non-clustered index can be created on multiple columns

Answer

Non-clustered index can only be created on one column, while clustered index can be created on multiple columns

Question 19

Which data structure is efficient for searching in a sorted list?

Accepted Answer

Binary search tree

Answer

Hash table

Answer

Array

Answer

Linked list

Question 20

In a database table, which constraint type ensures that each row has a unique identifier?

Accepted Answer

Primary Key Constraint

Answer

Foreign Key Constraint

Answer

Unique Key Constraint

Answer

Not Null Constraint

Question 21

Which of the following is **not** a data integrity constraint?

Accepted Answer

Data Type

Answer

Primary Key

Answer

Foreign Key

Answer

Unique Constraint

Question 22

Which data type is suitable for storing a student's name in a database?

Accepted Answer

Character

Answer

Integer

Answer

Boolean

Answer

Date

Question 23

Which data structure allows for efficient insertion at the end and deletion from the beginning?

Accepted Answer

Queue

Answer

Stack

Answer

Array

Question 24

Which data type is best suited for storing large amounts of text, such as articles or descriptions?

Accepted Answer

Text

Answer

Integer

Answer

Date

Question 25

Which data structure is used to store and organize data in key-value pairs, where each key is unique and associated with a single value?

Accepted Answer

Dictionary

Answer

Stack

Answer

Queue

Answer

Array

Question 26

What is the primary purpose of using a data structure?

Accepted Answer

To organize and store data efficiently for easy access and manipulation.

Answer

To secure data from unauthorized access.

Answer

To perform mathematical operations on data.

Question 27

Which of the following is NOT a characteristic of a data type?

Accepted Answer

Complexity

Answer

Size

Answer

Range

Question 28

Which data structure follows the Last-In, First-Out (LIFO) principle?

Accepted Answer

Stack

Answer

Tree

Answer

Queue

Answer

Linked List

Question 29

Which of the following is an example of a primary data type?

Accepted Answer

Integer

Answer

Record

Answer

File

Answer

Array

Question 30

What are the main advantages of utilizing a data structure compared to storing data in a flat file?

Accepted Answer

Improved data organization, faster retrieval, and easier updates.

Answer

Enhanced security

Answer

Reduced storage space

Question 31

Which data structure is most suitable for representing data with a hierarchical structure?

Accepted Answer

Tree

Answer

Linked List

Answer

Hash Table

Answer

Queue

Question 32

Which data type is most suitable for storing a customer's name?

Accepted Answer

String

Answer

Integer

Answer

DateTime

Answer

Boolean

Question 33

What is the key difference between a structured and an unstructured data structure?

Accepted Answer

Structured data has a predefined format and organization, while unstructured data does not.

Answer

Structured data is typically larger in size than unstructured data.

Answer

Unstructured data is always more efficient to store and retrieve.

Question 34

Which data structure is best suited for storing a set of unique values without duplicates?

Accepted Answer

Set

Answer

Array

Answer

Dictionary

Answer

Queue

Question 35

What is a primary advantage of using a linked list data structure?

Accepted Answer

Efficient insertion and deletion of elements

Answer

Guaranteed order of elements

Answer

Fast searching of elements

Answer

Compact memory usage

Question 36

Which of the following is NOT a built-in data type in SQL?

Accepted Answer

Image

Answer

String

Answer

Date

Answer

Integer

Question 37

What is the primary purpose of normalizing data in a relational database?

Accepted Answer

To reduce data redundancy and ensure data integrity

Answer

To facilitate data backup and recovery

Answer

To improve query performance

Question 38

Which indexing method is most efficient for searching large and sorted datasets?

Accepted Answer

B-tree indexing

Answer

Hash indexing

Answer

Linear indexing

Question 39

What is the fundamental difference between a primary key and a foreign key?

Accepted Answer

Primary key uniquely identifies a row in a table, while foreign key establishes a relationship between rows in different tables.

Answer

Primary key is always numeric, while foreign key can be of any data type.

Answer

Foreign key is used to enforce referential integrity, while primary key is not.

Question 40

What is the purpose of using a compound data type?

Accepted Answer

To group related data elements into a single unit

Answer

To simplify data validation

Answer

To enhance data security

Answer

To increase the efficiency of data storage

Question 41

Which data type is appropriate for storing whole numbers without decimal places like counting numbers?

Accepted Answer

Integer

Answer

String

Answer

Boolean

Answer

Double

Question 42

Which data structure efficiently organizes data in a sequential order, allowing for quick insertion and deletion operations?

Accepted Answer

Array

Answer

Tree

Answer

Stack

Answer

Graph

Question 43

Which data type is designed to store logical values, such as true or false?

Accepted Answer

Boolean

Answer

String

Answer

Float

Answer

Integer

Question 44

Which data structure consists of nodes connected by edges, enabling efficient traversal and analysis of complex relationships?

Accepted Answer

Graph

Answer

Linked List

Answer

Array

Answer

Queue

Question 45

Which data type is suitable for storing sequences of characters, including letters, numbers, and symbols?

Accepted Answer

String

Answer

Integer

Answer

Float

Answer

Boolean

Question 46

Which data structure follows a last-in, first-out (LIFO) principle, often used in scenarios like function calls?

Accepted Answer

Stack

Answer

Linked List

Answer

Queue

Answer

Array

Question 47

Which data type is capable of representing numbers with decimal parts, such as measurements or scientific data?

Accepted Answer

Float

Answer

Boolean

Answer

String

Answer

Integer

Question 48

Which data structure operates on a first-in, first-out (FIFO) principle, commonly used in message processing and queuing systems?

Accepted Answer

Queue

Answer

Linked List

Answer

Array

Answer

Stack

Question 49

Which data structure stores elements in a fixed-length, contiguous block of memory, allowing for efficient random access?

Accepted Answer

Array

Answer

Stack

Answer

Linked List

Answer

Queue

Question 50

Which data type offers versatility by accommodating a wide range of values, including numbers, characters, and special symbols?

Accepted Answer

String

Answer

Integer

Answer

Float

Answer

Boolean