HHA eXchange Interview Questions and Answers

Q1. SQL joins and examples
Ans. 
SQL joins are used to combine rows from two or more tables based on a related column between them.
• Types of SQL joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN.

• INNER JOIN returns rows when there is at least one match in both tables.

• LEFT JOIN returns all rows from the left table and the matched rows from the right table.

• RIGHT JOIN returns all rows from the right table and the matched rows from the left tab...read more
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Q1. Tell me about oops concepts?
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OOPs concepts are the fundamental principles of object-oriented programming.
• Encapsulation - bundling of data and methods that operate on that data

• Inheritance - ability of a class to inherit properties and characteristics from its parent class

• Polymorphism - ability of an object to take on many forms

• Abstraction - hiding of complex implementation details from the user
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Q2. Tell me about Web api routing?
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Web API routing is the process of mapping incoming HTTP requests to specific actions or methods in the API.
• Routing is defined in the WebApiConfig.cs file in the App_Start folder.

• Routes are defined using the HttpRouteCollection class.

• Routes can include parameters, constraints, and defaults.

• Attribute routing can also be used to define routes directly on controller actions.

• Routing can be used to handle different HTTP meth
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Q3. Stored procedure and functions difference?
Ans. 
Stored procedures are precompiled SQL statements that can be called by name, while functions return a single value.
• Stored procedures can modify data, while functions cannot

• Functions can be used in SQL statements, while stored procedures cannot

• Stored procedures can have output parameters, while functions cannot

• Functions can be called from within stored procedures, while stored procedures cannot be called from within fun
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Q4. What is CTE in SQL server?
Ans. 
CTE stands for Common Table Expression in SQL Server.
• CTE is a temporary named result set that can be referenced within a SELECT, INSERT, UPDATE, or DELETE statement.

• It helps to simplify complex queries and improve performance.

• It can be recursive, allowing a query to reference itself.

• It starts with the WITH keyword followed by the name of the CTE and the SELECT statement that defines it.
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Q5. Ref vs out difference
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Q6. Types of routing in asp .net
Ans. 
ASP.NET supports two types of routing: convention-based routing and attribute routing.
• Convention-based routing uses a set of predefined rules to map incoming URLs to controller actions.

• Attribute routing allows developers to define routes directly on the controller actions using attributes.

• Both types of routing can be used together in the same application.

• Example: [Route("api/products/{id}")] public IHttpActionResult Ge
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Q7. What is filters and types of filters in MVC?
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Filters are used to intercept and modify HTTP requests and responses in MVC.
• Filters are used to add functionality to MVC applications.

• There are five types of filters in MVC: Authorization, Action, Result, Exception, and Resource.

• Authorization filters are used to authenticate users and restrict access to certain actions.

• Action filters are used to modify the behavior of an action method before and after execution.

• Result ...read more
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Simple questions regarding arrays and matrix

Q1. What js .net core
Ans. 
ASP.NET Core is a cross-platform, high-performance framework for building modern, cloud-based, internet-connected applications.
• Open-source framework developed by Microsoft

• Supports multiple platforms including Windows, macOS, and Linux

• Used for building web applications, APIs, and microservices

• Provides high performance and scalability

• Includes features like dependency injection, middleware, and MVC pattern
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Q2. What is promise in JS
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Promise in JS is an object representing the eventual completion (or failure) of an asynchronous operation.
• A promise can be in one of three states: pending, fulfilled, or rejected.

• Promises help in handling asynchronous operations in a more organized and readable way.

• Example: const myPromise = new Promise((resolve, reject) => { // async operation });
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Quants verbal technical etc

Tricky dsa probs on arrays,stacks

Q1. Tell me bout urself
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Basic attitude, Verbal, reasoning

Q1. OOPS, DBMS, DSA, CN, OS
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Q1. Advanced Concepts of DBMS, DSA asp. net mvc asp. net core web services docker
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Q1. Tellme about you self?
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Q1. First round based on OOPS,DBMS and other basic questions.it was easy one in my case.
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Q2. They told me to explain about my project and asked me some questions on that it was basic one
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Q3. Difference between NoSQL and SQL,etc...
Ans. 
NoSQL is a non-relational database while SQL is a relational database.
• NoSQL databases are schema-less and flexible while SQL databases have a fixed schema.

• NoSQL databases are horizontally scalable while SQL databases are vertically scalable.

• NoSQL databases are better suited for handling unstructured data while SQL databases are better suited for structured data.

• Examples of NoSQL databases include MongoDB, Cassandra, an...read more
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Q1. In this they asked me about some questions on react and other js questions and other basic questions.
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Q2. Difference between overloading and overriding,React questions like props and others
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