20+ Axens India Interview Questions and Answers

Active and passive transformations are methods used in data integration to transform data from one format to another.

• Active transformations are used to change the number of rows that pass through the transformation, such as filtering or sorting data.

• Passive transformations do not change the number of rows that pass through the transformation, such as changing data types or renaming columns.

• Examples of active transformations include Filter, Sorter, and Router transformations.

• E...read more

Visualize data in Tableau using various charts and graphs.

• Select appropriate chart type based on data and analysis goal

• Use color, size, and shape to encode additional information

• Create interactive dashboards for exploration and analysis

• Utilize Tableau's built-in features such as filters and parameters

• Consider audience and design for effective communication

Call by value passes a copy of the variable's value, while call by reference passes a reference to the variable.

• Call by value passes the actual value of the variable being passed to a function.

• Call by reference passes a reference (memory address) of the variable being passed to a function.

• Changes made to the parameter in call by value do not affect the original variable, while changes in call by reference do.

Tableau was preferred due to its ease of use and better visualization capabilities.

• Tableau has a more user-friendly interface compared to Power BI.

• Tableau offers better visualization options and allows for more customization.

• Tableau has a larger community and more resources available for support.

• Power BI is more suitable for data modeling and analysis.

• The decision to use Tableau over Power BI was based on the specific needs of the project.

Informatica is a data integration tool used for ETL (Extract, Transform, Load) processes.

• Used for data integration and ETL processes

• Can connect to various data sources and targets

• Provides a graphical interface for designing and managing workflows

• Supports scheduling and monitoring of workflows

• Can handle large volumes of data

• Examples of use cases include data warehousing, data migration, and data synchronization

Design includes elements such as layout, color, typography, and functionality.

• Layout

• Color

• Typography

• Functionality

Tableau is a powerful data visualization tool that helps in analyzing and presenting complex data in an easy-to-understand format.

• Allows creation of interactive dashboards and reports

• Enables quick and easy data exploration

• Provides real-time collaboration and sharing of insights

• Supports integration with various data sources

• Offers advanced analytics and predictive modeling capabilities

Object oriented concepts are programming principles that revolve around objects and classes.

• Objects: Instances of classes that encapsulate data and behavior

• Classes: Blueprint for creating objects with attributes and methods

• Inheritance: Allows a class to inherit attributes and methods from another class

• Polymorphism: Ability for objects to take on different forms or behaviors

• Encapsulation: Bundling data and methods that operate on the data within a single unit

Program to check if a number is prime or not

• A prime number is only divisible by 1 and itself

• Start checking from 2 up to the square root of the number

• If the number is divisible by any number in the range, it's not prime

Transformations are changes made to data to convert it from one form to another.

• Transformations are used in data processing and analysis.

• They can involve changing the format, structure, or content of data.

• Examples include converting data from one file type to another, normalizing data, and aggregating data.

• Transformations can be performed using programming languages, tools, or software.

• They are important for data integration, data cleaning, and data analysis.

Workflow monitors are tools used to track and manage the progress of tasks in a workflow.

• Workflow monitors provide real-time visibility into the status of tasks in a workflow.

• They can be used to identify bottlenecks and optimize workflow efficiency.

• Examples of workflow monitors include Apache Airflow, Jenkins, and AWS Step Functions.

A data warehouse is a large, centralized repository of data that is used for analysis and reporting.

• Data is extracted from various sources and transformed into a common format

• Data is organized into dimensions and facts for efficient querying

• Used for business intelligence and decision-making

• Examples include Amazon Redshift, Microsoft Azure Synapse Analytics

Joins in SQL are used to combine data from two or more tables based on a related column.

• Joins are used to retrieve data from multiple tables in a single query

• There are different types of joins such as inner join, left join, right join, and full outer join

• The join condition is specified using the ON keyword followed by the column(s) to join on

• Example: SELECT * FROM table1 INNER JOIN table2 ON table1.column = table2.column

Error handling is the process of identifying, catching, and resolving errors in software programs.

• Errors can occur due to various reasons such as incorrect input, network issues, hardware failure, etc.

• Error handling involves using try-catch blocks, exception handling, and logging to handle errors.

• Proper error handling improves the reliability and usability of software programs.

• Examples of error handling include displaying error messages to users, retrying failed operations, a...read more

Tableau is a data visualization tool used for creating interactive dashboards and reports.

• Tableau allows users to connect to various data sources and create visualizations using drag-and-drop functionality.

• It offers a wide range of chart types, including bar charts, line charts, scatter plots, and maps.

• Tableau also has features for data blending, filtering, and forecasting.

• It is commonly used in business intelligence, data analytics, and data science.

• Examples of companies usi...read more

OOPs is a programming paradigm that focuses on objects and their interactions. Polymorphism is the ability of an object to take on many forms.

• OOPs stands for Object-Oriented Programming.

• It emphasizes on objects and their interactions.

• It includes concepts like inheritance, encapsulation, and abstraction.

• Polymorphism allows objects of different classes to be treated as if they were of the same class.

• It can be achieved through method overloading or method overriding.

• For example,...read more

Datamart is a subset of a data warehouse that is designed for a specific business unit or department.

• Datamarts are smaller than data warehouses and are designed for a specific purpose.

• They contain a subset of data from the larger data warehouse.

• They are often used by business analysts to analyze data specific to their department.

• Examples include sales datamarts, marketing datamarts, and finance datamarts.

Session is a way to store and maintain user-specific data during their visit to a website or application.

• Sessions are created when a user logs in or starts using an application.

• Data stored in a session can be accessed and modified throughout the user's visit.

• Sessions are typically stored on the server side and identified by a unique session ID.

• Common uses for session data include user authentication, shopping cart contents, and user preferences.

Program to reverse a string.

• Create an empty string to store the reversed string

• Loop through the original string from end to start

• Add each character to the new string

• Return the new string

I prefer working with Java as it is a versatile language with a strong community and vast libraries.

• Java is platform-independent and can be used for web development, mobile app development, and enterprise applications.

• Java has a vast collection of libraries and frameworks like Spring, Hibernate, and Struts.

• Java has a strong community and support system, making it easy to find solutions to problems.

• Java is a statically typed language, which helps catch errors at compile-time.

• J...read more

Destructor is a special member function in C++ that is called automatically when an object is destroyed.

• Destructors have the same name as the class preceded by a tilde (~).

• They are used to release resources allocated by the object during its lifetime.

• Example: ~ClassName() { // destructor code }