Kmg Infotech Interview Questions and Answers

Q1. Strecture of sql statement
Ans. 
SQL statements are used to interact with databases by performing operations like querying, updating, and deleting data.
• SQL statements are made up of keywords like SELECT, INSERT, UPDATE, DELETE, etc.

• They are structured in a specific order, with clauses like WHERE, ORDER BY, GROUP BY, etc.

• Tables are referenced using their names, and conditions are specified to filter data.

• Joins can be used to combine data from multiple
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Strong appitude knowledge is required.

Q1. String , arrays, oops
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Q1. What are oops concepts in java, explain real time scenario
Ans. 
OOPs concepts in Java include inheritance, polymorphism, encapsulation, and abstraction.
• Inheritance allows a subclass to inherit properties and methods from a superclass.

• Polymorphism allows objects to take on multiple forms and behave differently based on their context.

• Encapsulation hides the implementation details of an object and only exposes necessary information.

• Abstraction allows for the creation of abstract class...read more
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Q2. Uses of interface, inheritance
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Interfaces define contracts for behavior, while inheritance allows for code reuse and polymorphism.
• Interfaces allow for loose coupling and abstraction, enabling multiple implementations of the same behavior.

• Inheritance allows for code reuse and extension of existing classes, reducing code duplication.

• Polymorphism allows objects of different classes to be treated as if they were of the same class, simplifying code and i
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Q3. SQL query for join of tables
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SQL query for joining tables
• Use JOIN keyword to combine two or more tables based on a related column

• Specify the columns to be selected using SELECT keyword

• Use ON keyword to specify the condition for joining the tables

• Different types of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL OUTER JOIN
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Q4. Java concepts used in your project
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Used Java concepts such as inheritance, polymorphism, and exception handling in my project.
• Implemented inheritance to create a base class and derived classes with specific functionalities.

• Utilized polymorphism to allow objects of different classes to be treated as if they were of the same class.

• Implemented exception handling to handle errors and prevent program crashes.

• Used interfaces to define a set of methods that a ...read more
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Q5. Overloading vs overriding, practical uses
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Overloading is having multiple methods with the same name but different parameters. Overriding is having a method in a subclass with the same name and parameters as a method in the superclass.
• Overloading is used to provide different ways to call a method with different parameters

• Overriding is used to provide a specific implementation of a method in a subclass

• Overloading is resolved at compile-time while overriding is r...read more
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Java basic aptitude question in general

Core java oops and thread ,collection

Q1. Java basics and thread
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Q2. Oops, collection,JDBC, spring boot,
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Q1. What are development life cycles
Ans. 
Development life cycles are processes used to plan, design, build, test, and deploy software applications.
• There are several development life cycles, including Waterfall, Agile, and DevOps.

• The Waterfall model is a linear approach where each phase must be completed before moving on to the next.

• Agile methodologies focus on iterative development and continuous feedback.

• DevOps combines development and operations to create a...read more
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Q1. How did you do deployment
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Q1. What's your ctc and ectc
Ans. 
I prefer not to disclose my current or expected salary as it is not relevant to my qualifications and experience.
• I believe that my skills and experience are more important than my current or expected salary

• I am open to discussing compensation that is fair and competitive for the role and my qualifications

• I am more interested in the opportunity to work on challenging projects and grow my skills

• I would like to focus on h...read more
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