Vortex Engineering Service Engineer Interview Questions and Answers

Q1. Why do u want to leave your previous company
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Q2. When can you join
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Q1. 30 minutes of discussion.
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Q1. 75 minutes of discussion
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Q1. Basic C++, Multithreading
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Q2. Be prepared for a linked list question
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Q1. What is angular
Ans. 
Angular is a popular open-source web application framework developed by Google for building dynamic single-page applications.
• Angular is based on TypeScript, a superset of JavaScript.

• It follows the MVC (Model-View-Controller) architecture.

• Angular provides features like data binding, dependency injection, and routing.

• It has a powerful CLI (Command Line Interface) for scaffolding and building projects.

• Angular has a large ...read more
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Q2. What is directives and pipes
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Directives and pipes are features in Angular that allow developers to extend HTML functionality and transform data in templates.
• Directives are markers on a DOM element that tell Angular to attach a specified behavior to that DOM element or transform the DOM element and its children.

• Pipes are used to format data in a template. They take in data as input and transform it into the desired output for display.

• Examples of di...read more
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Question based on array string linkedlist

Few questions that would involve problem solving. Basic 10th std math would suffice

Had few DSA questions.

Q1. Technical interview
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Q1. About job, expection etc
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Q1. Basic 10-15btheorotical question
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Q2. Join + window funct question
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Q1. Difference Between Union and Union All
Ans. 
Union combines and removes duplicates, Union All combines without removing duplicates
• Union combines result sets and removes duplicates

• Union All combines result sets without removing duplicates

• Union is slower than Union All as it involves removing duplicates

• Example: SELECT column1 FROM table1 UNION SELECT column1 FROM table2;

• Example: SELECT column1 FROM table1 UNION ALL SELECT column1 FROM table2;
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Q2. SQL Execution order
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Q3. Coalesce function in SQL
Ans. 
Coalesce function in SQL is used to return the first non-null value in a list of expressions.
• Coalesce function takes multiple parameters and returns the first non-null value.

• It is commonly used to handle null values in SQL queries.

• Example: SELECT COALESCE(column_name, 'N/A') FROM table_name;
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