https://github.com/mastermindromii/sql-interview-preparation-questions

Welcome to my SQL interview preparation repository! This repo are a collection of common SQL questions and theoretical concepts that are frequently asked in Data Science & Analytics interviews!
https://github.com/mastermindromii/sql-interview-preparation-questions

Last synced: 9 days ago
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Welcome to my SQL interview preparation repository! This repo are a collection of common SQL questions and theoretical concepts that are frequently asked in Data Science & Analytics interviews!

• Host: GitHub
• URL: https://github.com/mastermindromii/sql-interview-preparation-questions
• Owner: MasterMindRomii
• Created: 2024-03-05T19:12:00.000Z (9 months ago)
• Default Branch: main
• Last Pushed: 2024-03-05T20:15:12.000Z (9 months ago)
• Last Synced: 2024-03-06T20:32:39.798Z (9 months ago)
• Size: 234 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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# SQL Interview Questions for Data Science

Welcome to my SQL interview preparation repository! Below are a collection of common SQL questions and theoretical concepts that are frequently asked in Data Science interviews.

## Common Questions

1. Write a query to add multiple columns in a table.

2. Write a query to add/delete multiple columns in a table.

3. Write a query to find out the 2nd highest value in a table.

4. Find the maximum value without using ORDER BY.

5. Find managers of all employees.

6. Use of wildcards.

7. If-else based questions.

8. Find category-wise top value.

9. Find/delete all the duplicate values.

10. Joining tables.

## Theory Questions

1. SQL Vs NoSQL Databases.

2. Tables required for many-to-many relationships.

3. Draw schema design for swiggy.

4. Types of Joins -> Union Vs Union All

5. OLAP Vs OLTP [Normalized Vs Denormalized Data]

6. Database keys

7. Types of normalization

8. What are indexes in Databases and what are its types

9. What are transactions in databases? Explain ACID properties.

10. Define

    - Views

    - Stored Procedures

Feel free to contribute by adding more questions or improving existing solutions!

## Contributing

Contributions are welcome! If you have additional SQL questions or improvements to existing solutions, feel free to open a pull request.

## License

This repository is licensed under the MIT License. See the [LICENSE](LICENSE) file for details.