10+ GyanDhan Interview Questions and Answers

API is a set of rules and protocols that allows different software applications to communicate with each other. Data Integration is the process of combining data from different sources into a single, unified view.

• API stands for Application Programming Interface and allows different software applications to communicate with each other.

• Data Integration involves combining data from different sources to provide a unified view.

• Basic SQL queries include SELECT, INSERT, UPDATE, and ...read more

Inheritance in Java allows a class to inherit properties and behaviors from another class.

• Inheritance allows for code reusability and promotes the concept of 'is-a' relationship.

• Subclasses can access the methods and fields of their superclass.

• Java supports single and multilevel inheritance but not multiple inheritance.

• Example: class Dog extends Animal {}

Synchronization in Java ensures that only one thread can access a shared resource at a time.

• Synchronization is achieved using the synchronized keyword in Java.

• It can be applied to methods or blocks of code.

• Synchronization prevents race conditions and ensures data consistency in multi-threaded programs.

SQL query to retrieve the highest salary from employee table

• Use the MAX() function to get the highest salary

• Select the salary column from the employee table

• Group by the salary column if there are multiple employees with the same highest salary

Basic software development principle is to write clean, maintainable, and efficient code.

• Follow coding standards and best practices

• Write modular and reusable code

• Document code for better understanding

• Test code thoroughly to ensure functionality

• Refactor code to improve performance

I have 5 years of experience leading and managing software development teams.

• Led a team of 8 developers in a project to revamp the company's website, ensuring timely delivery and high quality.

• Implemented Agile methodologies to improve team collaboration and productivity.

• Provided mentorship and guidance to junior team members, helping them grow their skills and advance in their careers.

Tableau offers various data refresh options including extract refresh, live connection, and incremental refresh.

• Tableau allows users to refresh data extracts manually or on a schedule.

• Live connections enable real-time data updates directly from the data source.

• Incremental refresh can be used to update only new or modified data since the last refresh.

Join query to retrieve data from two related tables

• Use INNER JOIN to combine rows from two tables based on a related column

• Specify the columns to select from each table in the SELECT statement

• Use ON clause to specify the related column for joining the tables

Integration is the process of connecting different systems or software applications to work together seamlessly.

• Integration allows for data sharing and communication between systems

• It helps streamline business processes and improve efficiency

• Examples include integrating Salesforce with other CRM systems, or integrating an e-commerce platform with a payment gateway