Database Connectivity for Web Development: A Comprehensive Guide

Question 1

Which SQL statement is used to create a new database in MySQL?

Accepted Answer

CREATE DATABASE

Answer

CREATE TABLE

Answer

INSERT INTO

Answer

SELECT * FROM

Question 2

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

Accepted Answer

To uniquely identify each row in the table

Answer

To store the most important data in the table

Answer

To enforce data integrity

Answer

To improve query performance

Question 3

Which PHP function is used to connect to a MySQL database?

Accepted Answer

mysqli_connect()

Answer

mysql_connect()

Answer

PDO::connect()

Answer

Db::connect()

Question 4

Which data type should you use to store a date and time value in a MySQL database?

Accepted Answer

DATETIME

Answer

INT

Answer

VARCHAR

Answer

DATE

Question 5

Which of the following is NOT a good practice for database optimization?

Accepted Answer

Using nested subqueries

Answer

Creating indexes on frequently queried columns

Answer

Caching frequently used queries

Answer

Normalizing data to eliminate redundancy

Question 6

What is the primary goal of using database connectivity in web development?

Accepted Answer

Store and manage data effectively

Answer

Improve the visual appeal of the user interface

Answer

Enhance the website's speed and performance

Answer

Facilitate communication between multiple web servers

Question 7

Which of these database models is widely employed in web development?

Accepted Answer

Relational

Answer

Hierarchical

Answer

Network

Answer

Object-oriented

Question 8

Explain the distinction between a database driver and a database API.

Accepted Answer

A driver is software that enables communication between the web application and the database, while an API provides a set of functions for interacting with the database.

Answer

A driver is a set of functions for interacting with the database, while an API is software that enables communication between the web application and the database.

Answer

A driver and an API have the same purpose and can be used interchangeably.

Answer

There is no difference between a database driver and a database API.

Question 9

Which of the following is **NOT** a common database type used for web applications?

Accepted Answer

Oracle

Answer

MySQL

Answer

PostgreSQL

Answer

MongoDB

Question 10

What is the primary purpose of a database connection pool in web development?

Accepted Answer

To improve database performance by minimizing connection overhead

Answer

To limit the number of concurrent database connections

Answer

To prevent unauthorized access to the database

Answer

To provide a graphical interface for managing database connections

Question 11

Which of the following is a valid SQL query to retrieve all data from a database table named 'customers'?

Accepted Answer

SELECT * FROM customers;

Answer

GET customers;

Answer

READ customers;

Answer

SHOW customers;

Question 12

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

Accepted Answer

A primary key uniquely identifies each row, while a foreign key references a primary key in another table.

Answer

A foreign key uniquely identifies each row, while a primary key references a foreign key in another table.

Answer

Both primary keys and foreign keys are used to enforce data integrity.

Answer

There is no distinction between a primary key and a foreign key.

Question 13

What is the primary goal of data validation in web development?

Accepted Answer

To guarantee that user-submitted data is accurate and complete

Answer

To safeguard the database against malicious attacks

Answer

To enhance the efficiency of database queries

Answer

To provide a backup mechanism in case of data loss

Question 14

What is the distinction between a stored procedure and a function in a database?

Accepted Answer

A stored procedure can encompass multiple operations, whereas a function is limited to a single operation.

Answer

A function can encompass multiple operations, whereas a stored procedure is limited to a single operation.

Answer

Stored procedures are pre-compiled, while functions are interpreted.

Answer

Functions are pre-compiled, while stored procedures are interpreted.

Question 15

Which of the following poses a potential security risk when establishing database connectivity in web applications?

Accepted Answer

SQL injection

Answer

Cross-site scripting (XSS)

Answer

Phishing

Answer

Malware distribution

Question 16

Which method is NOT used for connecting web applications to databases?

Accepted Answer

SOAP

Answer

JDBC

Answer

ODBC

Answer

ADO.NET

Question 17

What is the primary distinction between a primary key and a foreign key?

Accepted Answer

A primary key uniquely identifies a row in a table, while a foreign key references a column in another table

Answer

A foreign key uniquely identifies a row in a table, while a primary key references a column in another table

Answer

Both primary keys and foreign keys uniquely identify rows in tables

Answer

There is no distinction between a primary key and a foreign key

Question 18

What is the purpose of a database driver?

Accepted Answer

To facilitate the connection between a web application and a database

Answer

To execute SQL commands

Answer

To manage data transactions

Answer

To optimize database performance

Question 19

What is the primary purpose of a JOIN clause in a SQL statement?

Accepted Answer

To combine rows from multiple tables based on a shared column

Answer

To create a new database table

Answer

To delete rows from a table

Answer

To update data in a table

Question 20

Which of the following is NOT a potential security threat associated with database connectivity?

Accepted Answer

Server crashes

Answer

SQL injection attacks

Answer

Cross-site scripting attacks

Answer

Data leaks

Question 21

Which approach is considered best practice for managing database connections in a web application?

Accepted Answer

Creating a connection pool to reuse connections

Answer

Opening and closing connections within each request

Answer

Maintaining persistent connections for extended periods

Answer

Connecting to the database only when absolutely necessary

Question 22

What is a key advantage of using a NoSQL database compared to a relational database management system (RDBMS) like MySQL or PostgreSQL?

Accepted Answer

Flexibility in data modeling

Answer

Faster performance for large datasets

Answer

Enforced data integrity

Answer

Lower cost of ownership

Question 23

What is the process of establishing a connection between a web application and a database called?

Accepted Answer

Data connectivity

Answer

Data binding

Answer

Database integration

Answer

SQL injection

Question 24

Which of the following is **not** a widely used data type in SQL?

Accepted Answer

Array

Answer

Integer

Answer

String

Answer

Boolean

Question 25

What is the term for a unique identifier field commonly used in relational databases?

Accepted Answer

Primary key

Answer

Foreign key

Answer

Index

Answer

Constraint

Question 26

Which of the following is the standard port for establishing MySQL database connections?

Accepted Answer

3306

Answer

8080

Answer

3389

Answer

9000

Question 27

Which JDBC driver class is used to connect to a MySQL database?

Accepted Answer

com.mysql.cj.jdbc.Driver

Answer

com.oracle.jdbc.Driver

Answer

org.postgresql.Driver

Answer

java.sql.Driver

Question 28

What is the key role of a connection pool in database connectivity?

Accepted Answer

Manage and reuse database connections efficiently, reducing overhead.

Answer

Secure database connections from unauthorized access.

Answer

Optimize database performance by caching frequently used queries.

Question 29

Which of the following is a common approach to handling database connectivity errors?

Accepted Answer

Exception handling using try-catch blocks

Answer

Using a custom error reporting system

Answer

Ignoring errors and continuing program execution

Answer

Manually checking for errors after every database operation

Question 30

What is the significance of the 'autocommit' property in database connections?

Accepted Answer

Controls whether changes made to the database are committed automatically or not.

Answer

Determines the maximum number of simultaneous connections allowed.

Answer

Specifies the database user's authentication credentials.

Question 31

Which JDBC method is used to retrieve data from a database using a PreparedStatement?

Accepted Answer

executeQuery()

Answer

close()

Answer

executeUpdate()

Answer

execute()

Question 32

What is the primary purpose of using a database transaction?

Accepted Answer

To combine multiple database operations into a single logical unit, ensuring atomicity and consistency.

Answer

To increase the speed of database operations.

Question 33

Which of the following is a best practice for securing database connections?

Accepted Answer

Implement SSL encryption and utilize strong passwords.

Answer

Share database credentials with multiple users.

Answer

Store connection parameters in plaintext within the code.

Answer

Disable firewalls to allow unrestricted access to the database server.

Question 34

What are the primary advantages of utilizing stored procedures in database programming?

Accepted Answer

Improved code reusability, reduced development time, and enhanced performance

Answer

Enhanced data security and reduced query execution time

Answer

Simplified database maintenance and improved error handling

Question 35

Which database language is commonly used for querying relational databases like MySQL and PostgreSQL?

Accepted Answer

SQL

Answer

HTML

Answer

CSS

Answer

Java

Question 36

What is the primary function of a database driver in database connectivity?

Accepted Answer

Translate database commands into a format that the database system can execute.

Answer

Encrypt data for security.

Answer

Store data on the web server.

Question 37

What is the main purpose of using a connection pool in database connectivity?

Accepted Answer

Improves performance by reusing existing database connections.

Answer

Enhances data security by isolating connections.

Answer

Increases the maximum number of concurrent database connections.

Question 38

Which of the following is a typical type of error that can occur during database connectivity?

Accepted Answer

SQL syntax error

Answer

Page not found error

Answer

Unauthorized access error

Answer

HTTP 500 error

Question 39

What is the purpose of the 'WHERE' clause in a SQL statement?

Accepted Answer

Filter database rows based on specified criteria.

Answer

Insert data into a database table.

Answer

Create a new database table.

Question 40

Which of the following is a recommended best practice for ensuring database security in web applications?

Accepted Answer

Use prepared statements to prevent SQL injection attacks.

Answer

Store database passwords in plaintext.

Answer

Grant unrestricted access to all database users.

Question 41

What is a primary benefit of using an Object-Relational Mapping (ORM) framework in database connectivity?

Accepted Answer

Simplifies database interactions by mapping objects to database tables.

Answer

Increases database performance by optimizing queries.

Answer

Enhances database security by encrypting data.

Question 42

Which database connectivity model involves the database server and the web server being installed on the same computer?

Accepted Answer

Direct Connection

Answer

ODBC

Answer

JDBC

Question 43

What is the primary purpose of a connection pool?

Accepted Answer

To optimize database connections and minimize resource consumption.

Answer

To provide real-time data updates.

Answer

To store user credentials securely.

Question 44

What is the main purpose of a parameterized query?

Accepted Answer

To prevent SQL injection attacks by using placeholders for dynamic values.

Answer

To return only a specific number of rows from a query.

Answer

To improve database performance by optimizing query execution.

Question 45

Which of the following is a primary advantage of using a database abstraction layer (DAL)?

Accepted Answer

Simplifies database access code and reduces code duplication.

Answer

Provides encryption for data in transit.

Answer

Improves database performance.

Question 46

When is it essential to use a transaction in database operations?

Accepted Answer

To maintain data integrity and consistency across multiple database operations.

Answer

To store temporary data.

Answer

To enhance database performance.

Question 47

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

Accepted Answer

A primary key uniquely identifies a row in a table, while a foreign key references a primary key in another table, establishing a relationship.

Answer

A primary key is used for sorting data, while a foreign key is used for filtering.

Question 48

Which approach is considered a best practice for ensuring database connectivity security?

Accepted Answer

Utilizing parameterized queries and avoiding dynamic SQL.

Answer

Storing database credentials in plain text for convenience.

Answer

Allowing users to connect to the database without authentication.

Answer

Leaving the database server accessible from the internet.

Question 49

What is the primary purpose of an Entity-Relationship Diagram (ERD)?

Accepted Answer

To visually represent the relationships between entities in a database.

Answer

To generate database code automatically.

Answer

To store data in a structured format.

Question 50

What is the main purpose of a database connection string?

Accepted Answer

To establish a connection to a database.

Answer

To create tables and indexes.

Answer

To execute SQL commands.

Answer

To store confidential database credentials.

Question 51

Which SQL statement is used to retrieve data from a database?

Accepted Answer

SELECT

Answer

INSERT

Answer

CREATE

Question 52

What is the distinction between a primary key and a foreign key in the context of database table relationships?

Accepted Answer

A primary key uniquely identifies a row within a table, while a foreign key references a row in a different table, establishing a relationship between them.

Answer

A primary key is created automatically by the database, while a foreign key must be explicitly defined.

Question 53

Which database management system (DBMS) is widely recognized for its open-source nature and scalability?

Accepted Answer

MySQL

Answer

Microsoft SQL Server

Answer

IBM DB2

Answer

Oracle

Question 54

Which data type in a database is specifically designed to store dates and times?

Accepted Answer

TIMESTAMP

Answer

INTEGER

Answer

STRING

Answer

BOOLEAN

Question 55

What is the common name for a software application that provides a graphical user interface (GUI) for managing databases?

Accepted Answer

Database Management Tool

Answer

Database Visualization Tool

Answer

Database Editor

Answer

Database Query Tool

Question 56

In the context of web development, which HTTP request method is typically used to submit form data to a server for insertion into a database?

Accepted Answer

POST

Answer

PUT

Answer

DELETE

Answer

GET

Question 57

What is the primary purpose of a transaction in the context of database connectivity?

Accepted Answer

To ensure that a set of database operations either succeed or fail as a single unit, preserving data integrity.

Answer

To optimize database performance by grouping multiple operations together.

Answer

To obtain exclusive access to the database for a specific period.