SQL Interview Questions with Answers

1. How to change a table name in SQL?
This is the command to change a table name in SQL:
ALTER TABLE table_name
RENAME TO new_table_name;
We will start off by giving the keywords ALTER TABLE, then we will follow it up by giving the original name of the table, after that, we will give in the keywords RENAME TO and finally, we will give the new table name.

2. How to use LIKE in SQL?
The LIKE operator checks if an attribute value matches a given string pattern. Here is an example of LIKE operator
SELECT * FROM employees WHERE first_name like ‘Steven’;
With this command, we will be able to extract all the records where the first name is like “Steven”.

3. If we drop a table, does it also drop related objects like constraints, indexes, columns, default, views and sorted procedures?
Yes, SQL server drops all related objects, which exists inside a table like constraints, indexes, columns, defaults etc. But dropping a table will not drop views and sorted procedures as they exist outside the table.

4. Explain SQL Constraints.
SQL Constraints are used to specify the rules of data type in a table. They can be specified while creating and altering the table. The following are the constraints in SQL: NOT NULL CHECK DEFAULT UNIQUE PRIMARY KEY FOREIGN KEY

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5 beginner-friendly web development projects that can help you improve your skills

1. Personal Website or Portfolio:
   - Create a website that showcases your resume, projects, and skills.
   - Practice HTML and CSS to design the layout and style it.

2. To-Do List Application:
   - Build a simple to-do list app using HTML, CSS, and JavaScript.
   - Learn about DOM manipulation, event handling, and local storage.

3. Weather App:
   - Develop a web app that fetches and displays weather information for a user's location.
   - Use HTML, CSS, JavaScript, and APIs like OpenWeatherMap.

4. Blog or Blogging Platform:
   - Create a basic blog or expand it into a blogging platform.
   - Learn about databases (e.g., SQLite), server-side scripting (e.g., Node.js), and user authentication.

5. E-commerce Product Page:
   - Design a product page for an e-commerce site.
   - Practice building product grids, adding product details, and implementing a shopping cart feature.

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9 full-stack project ideas to build your portfolio:

🛍️ Online Store — product listings, cart, checkout, and payment integration

🗓️ Event Booking App — users can browse, book, and manage events

📚 Learning Platform — courses, quizzes, progress tracking

🏥 Appointment Scheduler — book and manage appointments with calendar UI

✍️ Blogging System — post creation, comments, likes, and user roles

💼 Job Board — post and search jobs, apply with resumes

🏠 Real Estate Listings — search, filter, and view property details

💬 Chat App — real-time messaging with sockets or Firebase

📊 Admin Dashboard — charts, user data, and analytics in one place

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JavaScript Array Methods Visualised

Beginner’s Roadmap to Learn Data Structures & Algorithms

1. Foundations: Start with the basics of programming and mathematical concepts to build a strong foundation.

2. Data Structure: Dive into essential data structures like arrays, linked lists, stacks, and queues to organise and store data efficiently.

3. Searching & Sorting: Learn various search and sort techniques to optimise data retrieval and organisation.

4. Trees & Graphs: Understand the concepts of binary trees and graph representation to tackle complex hierarchical data.

5. Recursion: Grasp the principles of recursion and how to implement recursive algorithms for problem-solving.

6. Advanced Data Structures: Explore advanced structures like hashing, heaps, and hash maps to enhance data manipulation.

7. Algorithms: Master algorithms such as greedy, divide and conquer, and dynamic programming to solve intricate problems.

8. Advanced Topics: Delve into backtracking, string algorithms, and bit manipulation for a deeper understanding.

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