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Peewee MCQs and Answers with Explanation: This article will undoubtedly assist aspirants who require Peewee Multiple Choice Questions to learn about the Peewee concept. These Peewee Quiz Questions will help you understand the types of questions that may be asked during an interview or placement examination. Here is a brief introduction to Peewee, after which you can answer the Peewee MCQ Questions to test your knowledge. Peewee is a lightweight and expressive Python Object-Relational Mapping (ORM) library. It allows developers to interact with relational databases using Python objects, making it easier to manage and manipulate data in a more intuitive and familiar way. Peewee is designed to be simple, flexible, and easy to use, making it a popular choice for building database-driven applications.
Peewee MCQ Questions & Answers
Peewee provides a simple and elegant API for working with SQL databases, including SQLite, MySQL, PostgreSQL, and more. It supports a wide range of operations on database records, including creating, reading, updating, and deleting records. Peewee also supports advanced features such as query composition, transaction management, and schema migrations. Now that you are familiar with Peewee, it’s time to assess your knowledge through this Peewee Quiz/ Top 25 Peewee Multiple Choice Questions.
Peewee Multiple Choice Questions
| Name | Peewee |
| Exam Type | MCQ (Multiple Choice Questions) |
| Category | Technical Quiz |
| Mode of Quiz | Online |
Top 25 Peewee MCQs and Answers | Peewee Quiz
1. What is Peewee?
a) A Python web framework
b) A Python library for database ORM
c) A Python package for machine learning
d) A Python package for data visualization
Answer: b)
Explanation: Peewee is a Python library for Object Relational Mapping (ORM) that simplifies database interactions by allowing developers to work with objects instead of raw SQL queries.
2. Which of the following is NOT a supported database by Peewee?
a) MySQL
b) PostgreSQL
c) SQLite
d) Oracle
Answer: d)
Explanation: While Peewee supports several popular databases such as MySQL, PostgreSQL, and SQLite, it does not support Oracle.
3. Which command is used to create a new Peewee model?
a) peewee.Model()
b) peewee.create_model()
c) peewee.new_model()
d) peewee.Model.create()
Answer: a)
Explanation: To create a new Peewee model, you would use the peewee.Model() class and define the fields and methods for the model.
4. What is the purpose of a ForeignKeyField in Peewee?
a) To define a relationship between two models
b) To define a field that stores a boolean value
c) To define a field that stores a date value
d) To define a field that stores an integer value
Answer: a)
Explanation: A ForeignKeyField is used to define a relationship between two models in Peewee.
5. Which of the following is the correct way to define a ForeignKeyField in Peewee?
a) peewee.ForeignKeyField(Model)
b) peewee.ForeignKeyField(‘Model’)
c) peewee.ForeignKeyField(Model, backref=’related_field’)
d) peewee.ForeignKey(‘Model’)
Answer: c)
Explanation: The correct way to define a ForeignKeyField in Peewee is with the model class as the first argument and an optional backref argument to define the reverse relationship.
6. How do you create a new record in a Peewee model?
a) model.create()
b) model.new()
c) model.add()
d) model.save()
Answer: a)
Explanation: To create a new record in a Peewee model, you would use the create() method on the model class.
7. What is the purpose of the select() method in Peewee?
a) To retrieve all records from a table
b) To retrieve a single record from a table
c) To specify which fields to retrieve in a query
d) To specify the order of records in a query
Answer: c)
Explanation: The select() method in Peewee is used to specify which fields to retrieve in a query.
8. Which of the following is the correct way to filter records in a Peewee query?
a) model.filter(field=’value’)
b) model.where(field=’value’)
c) model.find(field=’value’)
d) model.get(field=’value’)
Answer: a)
Explanation: The correct way to filter records in a Peewee query is with the filter() method, using the field and value to match on.
9. How do you delete records from a Peewee model?
a) model.delete()
b) model.remove()
c) model.destroy()
d) model.drop()
Answer: a)
Explanation: To delete records from a Peewee model, you would use the delete() method on the model class.
10. What is the purpose of the join() method in Peewee?
a) To combine two or more tables in a query
b) To retrieve only the distinct values of a field in a query
c) To group records by a field in a query
d) To limit the number of records returned in a query
Answer: a) The join()
method in Peewee is used to combine two or more tables in a query, allowing you to retrieve data from related tables.
11. How do you perform an inner join in Peewee?
a) model.join(Table)
b) model.join(Table, on=condition)
c) model.outer_join(Table)
d) model.cross_join(Table)
Answer: b)
Explanation: To perform an inner join in Peewee, you would use the join() method on the first model and specify the related table and the join condition.
12. What is the purpose of the GroupBy object in Peewee?
a) To group records by a field in a query
b) To combine two or more tables in a query
c) To retrieve only the distinct values of a field in a query
d) To limit the number of records returned in a query
Answer: a)
Explanation: The GroupBy object in Peewee is used to group records by a field in a query, allowing you to perform aggregate functions on the grouped data)
13. Which of the following is the correct way to use the GroupBy object in Peewee?
a) model.group_by(field)
b) model.group(field)
c) model.groupby(field)
d) model.group_by().field()
Answer: a)
Explanation: The correct way to use the GroupBy object in Peewee is with the group_by() method on the query object, specifying the field to group by.
14. What is the purpose of the aggregate() method in Peewee?
a) To group records by a field in a query
b) To combine two or more tables in a query
c) To retrieve only the distinct values of a field in a query
d) To perform aggregate functions on the query results
Answer: d)
Explanation: The aggregate() method in Peewee is used to perform aggregate functions on the query results, such as calculating the sum or average of a field)
15. Which of the following is an example of an aggregate function in Peewee?
a) max()
b) count()
c) avg()
d) All of the above
Answer: d)
Explanation: All of the above functions are examples of aggregate functions in Peewee that can be used with the aggregate() method)
16. How do you perform a subquery in Peewee?
a) model.subquery()
b) model.select().where(condition)
c) model.join(subquery, on=condition)
d) model.select().join(subquery)
Answer: b) To perform a subquery in Peewee, you would use the select() method on the model class and specify the condition for the subquery.
17. What is the purpose of the Window function in Peewee?
a) To group records by a field in a query
b) To perform aggregate functions on the query results
c) To retrieve a specific range of records in a query
d) To perform calculations on a sliding window of query results
Answer: d)
Explanation: The Window function in Peewee is used to perform calculations on a sliding window of query results, such as calculating a moving average.
18. Which of the following is the correct way to use the Window function in Peewee?
a) Window(function).over(order_by)
b) Window(order_by).function()
c) Window().function(order_by)
d) Window().over(function, order_by)
Answer: a)
Explanation: The correct way to use the Window function in Peewee is with the Window() class, specifying the function to apply and the order_by clause for the window.
19. What is the purpose of the Pagination object in Peewee?
a) To group records by a field in a query
b) To perform aggregate functions on the query results
c) To retrieve a specific range of records in a query
d) To perform calculations on a sliding window of query results
Answer: c)
Explanation: The Pagination object in Peewee is used to retrieve a specific range of records in a query, allowing you to implement pagination in your application.
20. Which of the following is the correct way to use the Pagination object in Peewee?
a) model.paginate(page_num, page_size)
b) model.limit(page_size).offset(offset)
c) model.offset(offset).limit(page_size)
d) model.page(page_num).limit(page_size)
Answer: d) The correct way to use the Pagination object in Peewee is with the page() method on the query object, specifying the page number and page size.
21. What is the purpose of the Atomic transaction in Peewee?
a) To group records by a field in a query
b) To perform aggregate functions on the query results
c) To retrieve a specific range of records in a query
d) To ensure that multiple database operations are treated as a single unit of work
Answer: d)
Explanation: The Atomic transaction in Peewee is used to ensure that multiple database operations are treated as a single unit of work, allowing you to roll back the entire transaction if an error occurs.
22. Which of the following is the correct way to use the Atomic transaction in Peewee?
a) with transaction.atomic(model)
b) model.atomic()
c) database.atomic(model)
d) with database.atomic():
Answer: d)
Explanation: The correct way to use the Atomic transaction in Peewee is with the with statement and the atomic() method on the database object.
23. What is the purpose of the ForeignKeyField in Peewee?
a) To define a one-to-one relationship between two tables
b) To define a one-to-many relationship between two tables
c) To define a many-to-one relationship between two tables
d) To define a many-to-many relationship between two tables
Answer: c)
Explanation: The ForeignKeyField in Peewee is used to define a many-to-one relationship between two tables.
24. Which of the following is the correct way to define a ForeignKeyField in Peewee?
a) ForeignKeyField(Table, on_delete=CASCADE)
b) ForeignKeyField(Table, related_name=field)
c) ForeignKeyField(Table, null=True)
d) All of the above
Answer: d)
Explanation: All of the above options are valid ways to define a ForeignKeyField in Peewee, depending on your requirements.
25. Which of the following options correctly describes the purpose of the backref attribute in Peewee?
A) It specifies the name of the foreign key field in a related model.
B) It provides a way to define the name of the reverse relation in a related model.
C) It allows a related model to be automatically fetched when a query is executed on the current model.
D) It is used to define a custom SQL query to fetch related models.
Answer: b)
Explanation: It provides a way to define the name of the reverse relation in a related model.
Explanation: The backref attribute is a powerful feature in Peewee that allows us to define the reverse relationship of a related model. In other words, it provides a way to define the name of the reverse relation in a related model.
For example, let’s consider a scenario where we have two models – Author and Book, with a one-to-many relationship between them (i.e., one author can have many books). We can define the relationship using a foreign key field in the Book model, referencing the Author model. Now, if we want to fetch all the books written by a particular author, we can use a simple query like books = Book.select().where(Book.author == author).
However, if we want to fetch all the books written by a particular author and also fetch the author for each book, we need to define the reverse relationship using the backref attribute. With the backref attribute, we can define the name of the reverse relationship (e.g., books in the Author model) and easily fetch all the books written by a particular author with a single query like author.books.
In summary, the backref attribute is used to define the reverse relationship between related models, making it easy to fetch related data with a single query.
In conclusion, Peewee is a lightweight and easy-to-use Python Object-Relational Mapping (ORM) library that simplifies working with relational databases. With its intuitive and flexible API, developers can quickly create, read, update, and delete records in a variety of SQL databases. Attempt this Peewee Quiz/ check out these Peewee MCQs to learn more about this concept. Whether you’re building a simple blog or a complex web application, Peewee is a great choice for managing your data and making database interactions more Pythonic. Keep checking our Freshersnow website frequently to know more IT-related concepts.