Covalense Global Interview Questions and Answers

Q1. All employees having same salary in the smae department sql and pysprk
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Q2. How to create pipeline in databricks
Ans. 
To create a pipeline in Databricks, you can use Databricks Jobs or Apache Airflow for orchestration.
• Use Databricks Jobs to create a pipeline by scheduling notebooks or Spark jobs.

• Utilize Apache Airflow for more complex pipeline orchestration with dependencies and monitoring.

• Leverage Databricks Delta for managing data pipelines with ACID transactions and versioning.
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Q3. Palindrome, 2nd char in every word make is to upper case, sql rank and dense rank releated questions , given 2 tables country and city we need to calculate total population in each continent by joining the...read more
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Q4. String manuplation questions inpython
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Print a specific pattern using any programming language.

Q1. What is a class in Object-Oriented Programming (OOP)?
Ans. 
A class in OOP is a blueprint for creating objects, defining their properties and behaviors.
• Classes are templates for creating objects in OOP

• They define the properties (attributes) and behaviors (methods) of objects

• Objects are instances of classes, each with its own unique data

• Inheritance allows classes to inherit properties and behaviors from other classes

• Encapsulation ensures that the data is hidden and can only be a...read more
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Q2. What is the difference between an abstract class and an interface?
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Abstract class can have both abstract and non-abstract methods, while interface can only have abstract methods.
• Abstract class can have constructors, fields, and methods, while interface cannot have any implementation.

• A class can only extend one abstract class, but can implement multiple interfaces.

• Abstract classes are used to define common characteristics of subclasses, while interfaces are used to define contracts for...read more
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Q3. What is joining and creating an inner join query?
Ans. 
Joining is combining data from two or more tables based on a related column, while an inner join query retrieves only the matching records.
• Joining is used to combine data from multiple tables in a database.

• Inner join query retrieves only the records that have matching values in both tables.

• Syntax for inner join: SELECT columns FROM table1 INNER JOIN table2 ON table1.column = table2.column;

• Example: SELECT orders.order_i...read more
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Q1. What is runtime polymorphism, and can you provide a code example to illustrate it?
Ans. 
Runtime polymorphism allows a subclass to provide a specific implementation of a method that is already provided by its parent class.
• Runtime polymorphism is achieved through method overriding, where a subclass provides its own implementation of a method that is already defined in its superclass.

• The method to be overridden must have the same name, return type, and parameters in both the superclass and subclass.

• When an o...read more
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Q2. Streams in java
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Streams in Java provide a way to process collections of objects in a functional style.
• Streams are sequences of elements that support various operations like filter, map, reduce, etc.

• They can be created from collections, arrays, or generate elements dynamically.

• Streams can be sequential or parallel, allowing for efficient processing of large datasets.

• Example: List<String> names = Arrays.asList("Alice", "Bob", "Cha...read more
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Q3. How do we create threads in Java, and how do we invoke them?
Ans. 
Threads in Java are created by extending the Thread class or implementing the Runnable interface, and invoked using the start() method.
• Threads can be created by extending the Thread class and overriding the run() method.

• Threads can also be created by implementing the Runnable interface and passing an instance of the class to a Thread object.

• Threads are invoked by calling the start() method on the Thread object.
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Q4. What is a Rest Template and how is it used?
Ans. 
Rest Template is a class in Spring that simplifies making HTTP requests and handling responses.
• Rest Template is part of the Spring framework in Java.

• It can be used to make HTTP requests to RESTful web services.

• It simplifies the process of making HTTP calls and handling responses.

• Rest Template can handle GET, POST, PUT, DELETE, etc. requests.

• Example: RestTemplate restTemplate = new RestTemplate();
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Q1. What is your work Experience
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I have 5 years of experience working as a mechanical engineer in the automotive industry.
• 5 years of experience in mechanical engineering

• Specialized in automotive industry

• Worked on designing and testing vehicle components

• Experience with CAD software for modeling and simulations
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Q2. Why am i looking for job change
Ans. 
Seeking new challenges and growth opportunities in a different environment.
• Looking for new challenges to enhance skills and knowledge

• Seeking better career growth opportunities

• Interested in exploring different work environments

• Want to broaden professional network
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Q1. What area i have covered testing
Ans. 
I have covered testing in areas such as software development, quality assurance, and system integration.
• Software testing methodologies such as unit testing, integration testing, and regression testing

• Quality assurance processes to ensure software meets requirements and standards

• System integration testing to verify that different components work together seamlessly
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Q2. What type of testing i have experience for
Ans. 
I have experience with various types of testing including unit testing, integration testing, system testing, and regression testing.
• Unit testing: Testing individual components or functions of the software in isolation.

• Integration testing: Testing how different components work together.

• System testing: Testing the entire system as a whole.

• Regression testing: Testing to ensure that new code changes do not adversely affect
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Q3. What is functional & Non functional Testing
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Functional testing ensures that the software functions as intended, while non-functional testing focuses on performance, usability, and security.
• Functional testing checks if the software meets the specified requirements.

• Non-functional testing evaluates aspects like performance, scalability, reliability, and security.

• Examples of functional testing include unit testing, integration testing, and system testing.

• Examples of...read more
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Q4. Give positive & Negative Example for a scenario in testing
Ans. 
Positive & Negative testing scenario examples
• Positive example: Testing a login form with valid credentials should allow the user to access the system

• Negative example: Testing a login form with invalid credentials should display an error message
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Q1. What will you do if you face challenge in job
Ans. 
I will approach the challenge methodically, seek help if needed, and work towards finding a solution.
• Assess the challenge and break it down into smaller tasks

• Research and gather information to understand the problem better

• Consult with colleagues or supervisors for advice or guidance

• Experiment with different solutions and adapt as needed

• Stay persistent and focused on finding a resolution
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Q2. What process you will follow for a critical Issue you find
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I will follow a systematic approach to identify, analyze, prioritize, and resolve the critical issue.
• Identify the critical issue and gather all relevant information

• Analyze the root cause of the issue and its impact on the system

• Prioritize the critical issue based on severity and potential impact

• Develop a plan of action to resolve the issue efficiently

• Implement the solution and monitor its effectiveness

• Document the enti
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