GREENTOUCH PROJECTS Interview Questions and Answers

Q1. What is the difference between Union and Union all ?
Ans. 
Union combines the results of two or more SELECT statements, while Union all includes all rows, including duplicates.
• Union removes duplicate rows from the result set, while Union all includes all rows.

• Union sorts the result set, while Union all does not.

• Union is slower than Union all because it performs a distinct operation.

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

• Example: SELECT column1 FRO
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Q2. Which query is more faster , joins or union?
Ans. 
Joins are generally faster than unions.
• Joins are typically faster than unions because they combine data from multiple tables based on a common column, while unions combine data from multiple queries into a single result set.

• Joins can utilize indexes on the columns being joined, which can improve performance.

• Unions involve combining the results of multiple queries, which can be slower as it requires merging and sorting ...read more
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Q1. All related to domain javascript/react,
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Q2. Fallback in lazy loading,optimization techniques/for API call
Ans. 
Fallback in lazy loading is important for optimizing API calls to ensure a smooth user experience.
• Implementing a loading spinner or placeholder while content is being loaded asynchronously

• Using a default value or cached data if the API call fails

• Implementing error handling to gracefully handle any issues with the API call
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Train,percentage,work

Array , string , basic

Q1. Basic dsa question and oops
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Q1. About company and traditaion question
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Coding test was of 1hr 20mins the test was totally on reactjs coding questions which consists of 22 questions , 10 mcqs 10 output based and 2 coding questions

Q1. React scenario based questions
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Q1. Problem Solving on any product
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Q2. Breakdown of any product
Ans. 
A breakdown of a product involves analyzing its components, features, functionality, and value proposition.
• Identify the key components of the product

• Analyze the features and functionalities of each component

• Evaluate the value proposition of the product in relation to customer needs and market trends
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20 question You have to Score 12

Q1. Basic question games and M testing
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Q1. Manual Testing question And Game related Questions
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Q2. Regression testing
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Q3. Smoke testing sanity
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Q1. PM round basic speaking
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Q1. Explain about react guard
Ans. 
React guard is a higher-order component used to restrict access to certain routes in a React application.
• React guard is used for implementing authentication and authorization in React applications.

• It can be used to prevent unauthorized users from accessing certain routes.

• React guard can redirect users to a login page if they are not authenticated.

• It can also be used to restrict access based on user roles or permissions
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Q2. Use of the axios interceptor
Ans. 
Axios interceptors are used to globally handle HTTP requests and responses in an application.
• Interceptors can be used to add headers, handle errors, or modify requests before they are sent.

• Example: Adding a token to all outgoing requests for authentication.

• Example: Logging all incoming responses for debugging purposes.
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