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Python Quiz for Beginners with Multiple Choice Questions
Which of the following statements best describes normalization in database design?
a. It is the method of organizing data to reduce duplication within a database
b. It is an optional concept that is rarely applied in database development
c. It involves converting normalized data back into a less organized format
d. None of these options are correct
Option a – It is the method of organizing data to reduce duplication within a database
What is the main function of the ROLLBACK command in SQL?
a. To apply and save the changes made during a transaction permanently
b. To cancel changes made within a transaction
c. To fetch information from a database
d. None of these options are correct
Option b – To cancel changes made within a transaction
In the SQL query SELECT * FROM Customers WHERE City = 'Berlin', what does ‘Berlin’ represent?
a. The name of the table being queried
b. The name of a column
c. A condition used to filter results
d. None of the above
Option c – A condition used to filter results
In Python’s sqlite3 module, how can you access the ID of the most recently inserted record?
a. By referencing the lastrowid property of the cursor
b. By calling the fetchone() method
c. By using the fetchall() method
d. None of the above
Option a – By referencing the lastrowid property of the cursor
Which SQL command is used to create a new index on a table?
a. CREATE INDEX
b. CREATE TABLE
c. CREATE DATABASE
d. None of these
Option a – CREATE INDEX
What is the function of the DROP DATABASE command in SQL?
a. Deletes specific tables within a database
b. Removes selected entries from a table
c. Deletes the entire database permanently
d. None of these
Option c – Deletes the entire database permanently
Which command is used in SQL to delete a row from a table?
a. DROP
b. DELETE
c. TRUNCATE
d. None of these
Option b – DELETE
What role does a foreign key play in relational databases?
a. It ensures all values in a column are unique
b. It adds an index to a column for faster access
c. It creates a relationship between two different tables
d. None of the above
Option c – It creates a relationship between two different tables
What does the HAVING clause do in an SQL statement?
a. Filters rows based on a condition before grouping
b. Groups rows based on a given column or expression
c. Filters results after they have been grouped
d. None of the above
Option c – Filters results after they have been grouped
Which of the following databases is classified as non-relational?
a. MongoDB
b. MySQL
c. PostgreSQL
d. SQLite
Option a – MongoDB
In Python, how is the executemany() function used within the sqlite3 module?
a. To run several SQL queries in a single call
b. To repeat the same query with multiple sets of data
c. To execute one query and return many result sets
d. None of these
Option b – To repeat the same query with multiple sets of data
What is the purpose of the UNION operator in SQL?
a. It merges results from multiple SELECT statements into a single output
b. It applies filters to rows based on conditions
c. It organizes results by grouping related data
d. None of the above
Option a – It merges results from multiple SELECT statements into a single output
How do you run a MySQL query in Python when using the pymysql library?
a. mysql_query(“SELECT * FROM table”)
b. execute(“SELECT * FROM table”)
c. connection.execute(“SELECT * FROM table”)
d. cursor.execute(“SELECT * FROM table”)
Option d – cursor.execute(“SELECT * FROM table”)
Which method retrieves every row returned by a MySQL query?
a. fetchone()
b. fetch_all()
c. fetch_row()
d. fetchmany()
Option b – fetch_all()
How can you access the ID of the last inserted record in MySQL with pymysql?
a. connection.last_row_id()
b. cursor.last_id
c. cursor.lastrowid
d. cursor.last_insert_id()
Option c – cursor.lastrowid
What does the WHERE clause do in a MySQL query?
a. Combines data from two tables
b. Sets the order of query results
c. Selects rows that match a specific condition
d. Groups similar rows by a shared value
Option c – Selects rows that match a specific condition
Which command creates a table in a MySQL database using pymysql?
a. CREATE
b. ADD
c. MAKE
d. INSERT
Option a – CREATE
Which MySQL data type is used to hold strings of varying lengths?
a. TEXT
b. VARCHAR
c. CHAR
d. STRING
Option b – VARCHAR
How can you change existing entries in a MySQL table through pymysql?
a. update_row()
b. alter_row()
c. modify_row()
d. UPDATE table SET column = value WHERE condition
Option d – UPDATE table SET column = value WHERE condition
What does the ORDER BY clause do in a MySQL statement?
a. Restricts how many results are returned
b. Groups rows with a shared value
c. Organizes the output in ascending or descending order
d. Filters records based on given criteria
Option c – Organizes the output in ascending or descending order
Which operator represents equality in MySQL syntax?
a. =
b. <>
c. !
d. ==
Option b – <>
What is the correct way to remove specific rows in a MySQL table using pymysql?
a. delete()
b. remove()
c. DROP row()
d. DELETE FROM table WHERE condition
Option d – DELETE FROM table WHERE condition
Which keyword ensures uniqueness for a column in a MySQL table definition?
a. UNIQUE
b. CONSTRAINT
c. KEY
d. INDEX
Option a – UNIQUE
What is the recommended way to catch exceptions while executing MySQL queries with pymysql in Python?
a. try-except block
b. if-else statement
c. assert statement
d. raise keyword
Option a – try-except block
What port number is typically used for MySQL database connections in pymysql?
a. 3306
b. 8080
c. 5432
d. 27017
Option a – 3306
Which method is commonly used to connect to a MySQL database via pymysql?
a. connect()
b. open()
c. start()
d. connect_to_database()
Option a – connect()
Which Python module is typically used for working with MySQL databases?
a. psycopg2
b. sqlalchemy
c. pymysql
d. sqlite3
Option c – pymysql
Why is the AS keyword used in a MySQL statement?
a. To assign an alias to a column or table
b. To merge two columns
c. To apply a function like SUM or AVG
d. To apply a filter condition
Option a – To assign an alias to a column or table
How can you find out how many rows were impacted by a query in pymysql?
a. cursor.rowCount
b. cursor.get_affected_rows()
c. cursor.affected_rows()
d. cursor.row_count()
Option a – cursor.rowCount
What is the standard character set used by default in pymysql connections?
a. ASCII
b. UTF-8
c. Latin1
d. Unicode
Option b – UTF-8
Which clause is used to control the maximum number of rows returned in a pymysql query?
a. LIMIT n
b. TOP n
c. ROWS n
d. FETCH n
Option a – LIMIT n
Why is the JOIN keyword used in MySQL?
a. To reduce the number of returned records
b. To filter records that meet specific criteria
c. To combine related records from two tables
d. To categorize records by a shared value
Option c – To combine related records from two tables
Which method retrieves the server version of the database using pymysql?
a. cursor.server_version
b. server_version()
c. SELECT @@VERSION
d. GET version()
Option a – cursor.server_version
Which SQL aggregate function is used to calculate the mean of values in a column?
a. COUNT()
b. SUM()
c. AVG()
d. MAX()
Option c – AVG()
What command would you use to add a new user in MySQL with pymysql?
a. CREATE USER ‘username’@’hostname’ IDENTIFIED BY ‘password’
b. ADD USER ‘username’@’hostname’ PASSWORD ‘password’
c. INSERT USER ‘username’@’hostname’ VALUES (‘password’)
d. REGISTER USER ‘username’@’hostname’ WITH PASSWORD ‘password’
Option a – CREATE USER ‘username’@’hostname’ IDENTIFIED BY ‘password’
What does the IN clause do in an SQL query?
a. Compares a column’s value to multiple specified values
b. Filters records by a condition
c. Divides records into groups based on a column
d. Restricts the number of rows returned
Option a – Compares a column’s value to multiple specified values
How can you assign access permissions to a MySQL user using pymysql?
a. GRANT ALL PRIVILEGES ON database.table TO ‘username’@’hostname’
b. GIVE ALL PRIVILEGES TO ‘username’@’hostname’ ON database.table
c. ALLOW ALL PRIVILEGES ON table FOR ‘username’@’hostname’
d. PRIVILEGE ALL TO ‘username’@’hostname’ ON database.table
Option a – GRANT ALL PRIVILEGES ON database.table TO ‘username’@’hostname’
What does the DROP statement do in MySQL?
a. Removes the entire database
b. Removes a complete table
c. Deletes a single record
d. Removes a specific column
Option a – Removes the entire database
Which approach retrieves column count details from a MySQL query result in pymysql?
a. cursor.col_count()
b. cursor.column_count
c. cursor.description
d. cursor.get_columns_count()
Option b – cursor.column_count
What role does a connection pool play when linking Python to an SQL database?
a. It supports several database connections at the same time
b. It enhances SQL query execution speed
c. It minimizes the chance of data corruption
d. It’s unnecessary when using Python with SQL databases
Option a – It supports several database connections at the same time
Which of the following is NOT a typical SQL database used with Python?
a. MySQL
b. SQLite
c. MongoDB
d. PostgreSQL
Option c – MongoDB
What is the safest method for passing parameters to SQL queries in Python to avoid injection threats?
a. Clean the user input before using it in the query
b. Use parameterized queries (prepared statements)
c. Call stored procedures
d. All of the above
Option d – All of the above
What format is commonly used for connection strings in Python when connecting to an SQL database?
a. jdbcc://user:password@hostname:port/dbname
b. sql://user:password@hostname:db
c. sql://username:password@hostname:port/dbname
d. jdbc://user:password@hostname:db
Option c – sql://username:password@hostname:port/dbname
How can you verify if a connection to an SQL database was established successfully in Python?
a. Confirm that the cursor remains open
b. Check whether the connection object is null
c. Catch and handle connection-related exceptions
d. All of the above
Option d – All of the above
Which Python module is specifically built for PostgreSQL database communication?
a. pyodbc
b. SQLAlchemy
c. psycopg2
d. pymysql
Option c – psycopg2
What is the correct way to terminate a database connection in Python?
a. connection.close()
b. cursor.close()
c. Both A and B
d. Neither A nor B
Option c – Both A and B
In SQLAlchemy, what does the acronym ORM stand for?
a. Object-Relational Mapping
b. Object-Resource Mapping
c. Object-Routing Mapping
d. Object-Remote Mapping
Option a – Object-Relational Mapping
Is it necessary to install a unique driver in Python for each SQL database type you want to use?
a. True
b. False
Option b – False
What is a major benefit of using stored procedures with Python-connected SQL databases?
a. Faster performance
b. Better security
c. Simpler execution logic
d. All of the above
Option d – All of the above
Which of these is a widely-used DBMS (Database Management System) for Python programs?
a. MySQL
b. PostgreSQL
c. Microsoft SQL Server
d. All of the above
Option d – All of the above
Which Python package is most commonly used to work with MySQL databases?
a. pyodbc
b. psycopg2
c. pymysql
d. SQLAlchemy
Option c – pymysql
What is one way to get SQL query results into a pandas DataFrame in Python?
a. Export the query results to a CSV file and then load the file into a DataFrame
b. utilize the pd.read_sql_query() method to load results directly into a DataFrame
c. apply the db.to_dataframe() method to transform the database output
d. change the query output into JSON and then convert it into a DataFrame using pandas
Option b – utilize the pd.read_sql_query() method to load results directly into a DataFrame
Which approach is commonly used in Python to secure SQL database credentials?
a. Saving database login information in plain text files
b. Embedding credentials directly in the source code
c. Storing credentials in environment variables
d. Supplying credentials through command-line arguments
Option c – Storing credentials in environment variables
What is a reliable way to verify the existence of a table in Python before running an SQL command?
a. Execute a query that checks if the table is present
b. Use the cursor.execute() function directly
c. Apply the exists_table() method
d. Query the INFORMATION_SCHEMA for table details
Option a – Execute a query that checks if the table is present
What is the main role of the commit() method in Python SQL operations?
a. Revert modifications made to the database
b. Confirm and save changes during a transaction
c. Terminate the database session
d. Cancel an ongoing transaction
Option b – Confirm and save changes during a transaction
How can indexing be used to improve SQL query performance in Python?
a. Implement the CREATE INDEX SQL command
b. Fetch rows with the fetchone() method
c. Optimize the query using the optimize() method
d. Apply the GROUP BY clause to the query
Option a – Implement the CREATE INDEX SQL command
Which of the following is not a benefit of using an ORM with Python for SQL databases?
a. Cleaner and easier code maintenance
b. Better enforcement of data accuracy
c. Seamless conversion of Python objects to database tables
d. Enhanced query performance
Option d – Enhanced query performance
What should you do in Python to reverse a transaction if an error occurs during an SQL query?
a. Call the rollback() method
b. Use the undo() method
c. Use the cancel() method
d. Execute a command with a rollback flag
Option a – Call the rollback() method
What does the autocommit setting do in SQL databases when working with Python?
a. Commits each transaction automatically
b. Reverses each transaction by default
c. Prevents transaction data from being saved
d. Enhances database security
Option a – Commits each transaction automatically
What strategy is often used to boost SQL database efficiency when accessed through Python?
a. Creating and calling stored procedures
b. Indexing columns that are queried frequently
c. Structuring data using normalization
d. All of the above
Option d – All of the above
How can Python code gracefully handle database errors and inform users effectively?
a. Raise custom errors using the raise keyword
b. Print error messages using the print statement
c. Record errors using the logger module
d. All of the above
Option d – All of the above
What is the main benefit of using connection pooling in Python when dealing with database access?
a. Limits the total number of simultaneous database connections
b. Enhances performance by reusing connections
c. Helps ensure data consistency
d. Protects against SQL injection vulnerabilities
Option a – Limits the total number of simultaneous database connections
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