BYJU'S Interview Questions and Answers

The difference between get and filter methods in query sets in Django.

• get method retrieves a single object that matches the query criteria, while filter method retrieves a queryset containing all objects that match the query criteria.

• To retrieve data for a person whose name starts with 'S', you can use filter method with the query {'name__startswith': 'S'}.

• The return type of get method is a single object or raises a DoesNotExist exception if no object is found, while the retu...read more

Example code for an API implementing CRUD operations on a model using different HTTP methods

• Use Django REST framework to create API views for each HTTP method (GET, POST, PUT, DELETE)

• Define URL patterns in Django's urls.py to map to the corresponding API views

• Implement logic in the API views to interact with the model and perform CRUD operations

• Use serializers to convert model instances to JSON data and vice versa

Yes, AWS Lambda is considered serverless. To access an object in a different region, you can use S3 Cross-Region Replication or make the object public.

• AWS Lambda is a serverless computing service that allows you to run code without provisioning or managing servers.

• To access an object in a different region stored in an S3 bucket, you can use S3 Cross-Region Replication to automatically replicate objects across different AWS regions.

• Alternatively, you can make the object public...read more

SQL queries to find employees starting with 'S' and count employees in each department.

• Use SELECT statement with WHERE clause to find employees starting with 'S': SELECT name FROM employees WHERE name LIKE 'S%'

• Use GROUP BY clause with COUNT function to count employees in each department: SELECT department, COUNT(*) FROM employees GROUP BY department

Different types of search algorithms with their time complexity

• Linear Search - O(n)

• Binary Search - O(log n)

• Depth First Search (DFS) - O(V + E)

• Breadth First Search (BFS) - O(V + E)

• A* Search - O(b^d)

• Greedy Best First Search - O(b^m)

ViewSets provide a simple way to create CRUD APIs with less code compared to ModelSets.

• ViewSets reduce boilerplate code by providing default implementations for common actions like create, retrieve, update, and delete.

• ViewSets allow for more flexibility and customization compared to ModelSets, as they can be easily extended and customized to fit specific requirements.

• ViewSets are more concise and readable, making it easier for developers to understand and maintain the codebas...read more

Smoke testing is a subset of regression testing, while sanity testing is a subset of acceptance testing.

• Smoke testing is done to check if the critical functionalities of the software are working fine after changes.

• Sanity testing is done to check if the specific functionalities are working fine after bug fixes or minor changes.

• Smoke testing is a broad and shallow approach, while sanity testing is a narrow and deep approach.

• Smoke testing is usually done before detailed testing,...read more

MVC stands for Model-View-Controller, a design pattern used in Django to separate the application into three interconnected components.

• Model represents the data and business logic of the application.

• View handles the presentation layer and interacts with the user.

• Controller acts as an intermediary between the Model and View, handling user input and updating the Model and View accordingly.

• Django's implementation of MVC is slightly different, with the View and Controller combine...read more