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1 / 54

When should a composite unique identifier be used in a database design?

When there are multiple attributes that together uniquely identify an entity

When a foreign key is used to link two entities together

When an entity has a many-to-many (N:N) relationship with another entity

When there is a one-to-one (1:1) relationship between two entities

2 / 54

Which database model stores data in objects with attributes and methods, similar to object-oriented programming?

Network Database Model

Relational Database Model

Hierarchical Database Model

Object-Oriented Database Model

3 / 54

In a database, how is a many-to-many (N:N) relationship between two entities typically resolved?

By using a one-to-many (1:N) relationship between the entities

By denormalizing the database structure for better performance

By combining the attributes of both entities into a single entity

By creating a composite entity (junction table) with foreign keys to both entities

4 / 54

How is the result set sorted in ascending order using a SELECT statement?

ORDER BY

DESC

SORT ASCENDING

ASC

5 / 54

Which of the following activities is NOT part of the requirements gathering process for database design?

Implementing database security measures

Analyzing existing data and systems

Creating Entity-Relationship Diagrams (ERDs)

Conducting interviews with key stakeholders

6 / 54

Why is it important to accurately map entities, columns, and data types in a database?

It guarantees that the database can handle a large number of concurrent users

It eliminates the need for creating relationships between tables

It simplifies the process of creating primary keys for each table

It ensures that data can be retrieved and stored correctly in the database

7 / 54

What does ACID stand for in the context of database transactions?

Association, Constraint, Index, Data

Aggregate, Commit, Isolate, Distribute

Atomicity, Consistency, Isolation, Durability

All Columns In Database

8 / 54

At which level of data abstraction is the database schema defined?

Conceptual level

External level

Physical level

Logical level

9 / 54

When creating a foreign key relationship, which of the following statements is true?

The foreign key can be null in the referencing table

The foreign key must have a unique index applied to it

The foreign key and primary key must be of different data types

The foreign key must have the same name as the primary key in the referencing table

10 / 54

What is the highest level of data abstraction in a database system?

Physical level

Conceptual level

External level

Logical level

11 / 54

When mapping the physical model, why is it important to consider data types?

Data types affect the efficiency of data retrieval operations

Data types determine the available storage space for each attribute

Data types determine the relationships between tables

Data types determine the order of execution for database operations

12 / 54

Which of the following is a valid cardinality notation for a one-to-many relationship in a physical data model?

(1, 1)

(0, 1)

(1, N)

(N, M)

13 / 54

What is the primary step in creating a physical model?

Normalizing the database tables

Defining the data types for each attribute

Identifying entities and their relationships

Establishing primary and foreign key relationships

14 / 54

What is a relationship in data modeling?

A connection between entities

An attribute of a table

A field in a table

A table in the database

15 / 54

What is the purpose of denormalization in the physical model?

To reduce data redundancy and inconsistency

To define relationships between tables

To enforce data integrity constraints

To optimize database performance

16 / 54

In a physical data model, what are foreign keys used for?

To define the relationships and links between tables

To specify the attributes and data types for each table

To represent the logical structure and properties of database objects

To improve performance by storing frequently accessed data together

17 / 54

Which of the following statements is used to retrieve data from a database?

INSERT

DELETE

UPDATE

SELECT

18 / 54

What is the purpose of the COMMIT statement in SQL?

To insert data into a table

To update data in a table

To delete data from a table

To make permanent changes to the database

19 / 54

In a physical model, what is the purpose of denormalization?

To reduce data redundancy and improve data integrity

To establish relationships between tables

To optimize the database for efficient querying

To define the table structures and attributes

20 / 54

Which of the following is NOT typically included in a physical data model?

Data type specifications for attributes

Entity-relationship diagrams

Tables and columns

Primary and foreign key constraints

21 / 54

Which of the following data modeling techniques allows for the creation of relationships between entities?

Document modeling

Relational modeling

Hierarchical modeling

Entity-Attribute-Value (EAV) modeling

22 / 54

What purpose does mapping fulfill in a physical model?

To specify the primary keys for each table

To establish the relationships between tables

To define the table structures and attributes

To optimize the database for efficient querying

23 / 54

Which keyword is used to retrieve data from specific columns in a SELECT statement?

SELECT

GROUP BY

WHERE

FROM

24 / 54

Which keyword is used to filter data in a SELECT statement?

HAVING

ORDER BY

WHERE

GROUP BY

25 / 54

What is a database?

A program that manages data

A collection of related data

A network of interconnected computers

A physical storage device for data

26 / 54

Which SQL keyword is used to delete data from a table?

DELETE

ERASE

DROP

REMOVE

27 / 54

What is a primary key?

A unique identifier for a data entity

A foreign key in a related table

An attribute that can have multiple values

A reserved word in SQL

28 / 54

Why is it important to normalize entity relationships in a physical data model?

To define primary and foreign key constraints

To enforce data type specifications

To improve data query performance

To eliminate data redundancy

29 / 54

Which keyword is used to filter results based on a specific condition in a SELECT statement?

ORDER BY

HAVING

WHERE

GROUP BY

30 / 54

What is the difference between a logical model and a physical model in database design?

A logical model represents the database structure in terms of entities and relationships, while a physical model represents the actual implementation of the database

A logical model is used for small-scale databases, while a physical model is used for large-scale databases

A logical model is created by developers, while a physical model is created by database administrators

A logical model focuses on performance optimization, while a physical model focuses on data integrity

31 / 54

What is a foreign key in a relational database?

A key that can have duplicate values

A constraint that ensures data integrity

A primary key from another table

A key used to establish relationships between tables

32 / 54

What is the role of database indexes in mapping a physical model?

To ensure data integrity

To define relationships between tables

To optimize database access and retrieval

To determine the data types for each column

33 / 54

Which SQL statement is used to create a new table?

UPDATE

CREATE TABLE

INSERT INTO

DELETE FROM

34 / 54

Which keyword is used to join two or more tables in a SQL statement?

INNER JOIN

CROSS JOIN

JOIN

UNION

35 / 54

What is the purpose of a transaction in a database?

To ensure the atomicity, consistency, isolation, and durability of database operations

To enforce data integrity and security in a database

To execute queries and retrieve data from a database

To define the structure and organization of a database

36 / 54

What is a primary key in a database?

A way to encrypt sensitive data in a database

A data type used to store numerical values

A unique identifier for a specific record in a table

A secondary index used for optimizing query performance

37 / 54

What is the purpose of creating constraints in the physical model?

To enforce data integrity constraints

To specify data types for columns

To optimize database performance

To define relationships between tables

38 / 54

What is the role of normalization during the mapping of the physical model?

To eliminate redundancy in the database

To ensure data integrity and consistency

To determine the primary key of each table

39 / 54

What is the purpose of mapping the physical model in database design?

To define the relationships between tables

To optimize database performance

To ensure data integrity

To define the data types for each column

40 / 54

What is the purpose of defining physical storage structures when mapping a physical model?

To establish primary and foreign key constraints

To determine the data types for each column

To optimize database access and storage

To define relationships between tables

41 / 54

Which SQL statement is used to add a new column to an existing table?

ALTER TABLE

INSERT INTO

DELETE FROM

UPDATE

42 / 54

Which of the following is a key component of a database system?

Database Management System (DBMS)

All of the above

Data

Database Application

43 / 54

What is the primary purpose of a database?

To perform complex calculations

To provide internet access

To store data in an organized manner

To manage operating systems

44 / 54

How does a relational database model differ from a flat database model?

Relational databases store data in a linear format, while flat databases store data in a grid format

Flat databases are more secure than relational databases

Relational databases support multiple tables, while flat databases consist of a single table

Flat databases are faster than relational databases

45 / 54

Which of the following is a type of database model?

Relational

All of the above

Object-Oriented

Flat

46 / 54

What is a characteristic of a relational database?

Data is organized into tables

All of the above

Tables can be linked by keys

Data integrity is maintained through constraints

47 / 54

Why are relational databases important in business?

They allow for efÏcient data management

All of the above

They support complex queries and reporting

They provide a scalable solution for data storage

48 / 54

How does a network database model differ from a relational database model?

Network models are easier to query than relational models

Relational models are more flexible than network models

Network models use pointers to link records, while relational models use keys

Relational models require more storage space than network models

49 / 54

What is one of the major transformations in database technology?

All of the above

The shift from hierarchical to relational models

The development of NoSQL databases

The integration of cloud-based databases

50 / 54

Which type of database model uses objects to represent data?

Network

Relational

Hierarchical

Object-Oriented

51 / 54

What is the primary function of a Database Management System (DBMS)?

To provide hardware support for database servers

To manage network connections

To interact with end-users and applications to capture and analyze data

To encrypt data for security

52 / 54

Which of the following is NOT a consideration when determining the relationships between tables during mapping of the physical model?

Primary key constraints

Table naming conventions

Cardinality

Foreign key constraints

53 / 54

What is the purpose of denormalization in a physical model?

To improve data retrieval performance

To eliminate all redundancy in the database

To enforce data integrity

To establish primary and foreign key relationships

54 / 54

What is a primary key in a relational database?

A field that can have multiple values

A foreign key that points to another table

A constraint that ensures data integrity

A unique identifier for each record in a table

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