🚀Top 40 CSS Interview questions:

Q1: Explain the three main ways to apply CSS styles to a web page. 🖌
Q2: What is CSS? 🧐
Q3: How to use variables in Sass? 💡
Q4: Explain CSS sprites, and how you would implement them on a page or site. 🎨
Q5: Explain the CSS box model and the layout components that it consists of. 📦
Q6: What is a CSS rule? 📜
Q7: Explain what the @extend directive is used for in Sass? 🚀
Q8: Have you played around with the new CSS Flexbox or Grid specs? 🎛
Q9: What is DOM (Document Object Model) and how is it linked to CSS? 🧩
Q10: What is Sass? 💻
Q11: What existing CSS frameworks have you used locally, or in production? How would you change/improve them? 🛠
Q12: Describe floats and how they work. 🌊
Q13: What is Selector Nesting in Sass used for? 🕸
Q14: List out the key features of Sass. ✨
Q15: What is the difference between classes and IDs in CSS? 🔖
Q16: List out the data types that Sass supports. 📊
Q17: What's the difference between SCSS and Sass? 🤔
Q18: Explain the usage of the table-layout property. 🗃
Q19: What's the difference between a relative, fixed, absolute, and statically positioned element? 📍
Q20: Have you ever worked with retina graphics? If so, when and what techniques did you use? 👓
Q21: What are the advantages/disadvantages of using CSS preprocessors? ⚖️
Q22: How is responsive design different from adaptive design? 📱
Q23: What are CSS selectors? Name some. 🔍
Q24: What does Accessibility (a11y) mean? ♿️
Q25: What is a CSS preprocessor and why use one? 💻
Q26: How would you approach fixing browser-specific styling issues? 🛠
Q27: What’s the difference between resetting and normalizing CSS? Which would you choose, and why? 🧹
Q28: Explain your understanding of the box model and how you would tell the browser in CSS to render your layout in different box models. 🖼
Q29: Describe pseudo-elements and discuss what they are used for. 👻
Q30: How does CSS actually work (under the hood of the browser)? 🛠
Q31: What is a Grid System in CSS? 📐
Q32: Explain the purpose of clearing floats in CSS. 🧼
Q33: What does * { box-sizing: border-box; } do? What are its advantages? 🛡
Q34: Can you explain the difference between coding a website to be responsive versus using a mobile-first strategy? 📱➡️💻
Q35: Explain the basic rules of CSS Specificity. 📊
Q36: How do you optimize your webpages for print? 🖨
Q37: Have you ever used a grid system, and if so, what do you prefer? 🔲
Q38: What are the different ways to visually hide content (and make it available only for screen readers)? 👀🙈
Q39: Describe z-index and how a stacking context is formed. 📚
Q40: Is there any reason you'd want to use translate() instead of absolute positioning, or vice versa? And why? 🔄

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What types of SQL commands (or SQL subsets) do you know?
Data Definition Language (DDL) – to define and modify the structure of a database.
Data Manipulation Language (DML) – to access, manipulate, and modify data in a database.
Data Control Language (DCL) – to control user access to the data in the database and give or revoke privileges to a specific user or a group of users.
Transaction Control Language (TCL) – to control transactions in a database.
Data Query Language (DQL) – to perform queries on the data in a database to retrieve the necessary information from it.

examples of common SQL commands
DDL: CREATE, ALTER TABLE, DROP, TRUNCATE, and ADD COLUMN
DML: UPDATE, DELETE, and INSERT
DCL: GRANT and REVOKE
TCL: COMMIT, SET TRANSACTION, ROLLBACK, and SAVEPOINT
DQL: – SELECT

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SQL interview questions:

1. What is the purpose of the GROUP BY clause in SQL? Provide an example.
2. Explain the difference between an INNER JOIN and a LEFT JOIN with examples.
3. Discuss the role of the WHERE clause in SQL queries and provide examples of its usage.
4. Explain the concept of database transactions and the ACID properties.
5. Describe the benefits of using subqueries in SQL and provide a scenario where they would be useful.
6. Discuss the differences between the CHAR and VARCHAR data types in SQL.
7. Explain the purpose of the ORDER BY clause in SQL queries and provide examples.
8. Describe the importance of data integrity constraints such as NOT NULL, UNIQUE, and CHECK constraints in SQL databases.
9. Discuss the advantages and disadvantages of using stored procedures
Explain the difference between an aggregate function and a scalar function in SQL, with examples.
10. Discuss the role of the COMMIT and ROLLBACK statements in SQL transactions.
11. Explain the purpose of the LIKE operator in SQL and provide examples of its usage.
12. Describe the concept of normalization forms (1NF, 2NF, 3NF) and why they are important in database design.
13. Discuss the differences between a clustered and non-clustered index in SQL.
14. Explain the concept of data warehousing and how it differs from traditional relational databases.
15. Describe the benefits of using database triggers and provide examples of their usage.
16. Discuss the concept of database concurrency control and how it is achieved in SQL databases.
17. Explain the role of the SELECT INTO statement in SQL and provide examples of its usage.
18. Describe the differences between a database view and a materialized view in SQL.
19. Discuss the advantages of using parameterized queries in SQL applications.
20. Write a query to retrieve all employees who have a salary greater than $100,000.
21. Create a query to display the total number of orders placed in the last month.
22. Write a query to find the average order value for each customer.
23. Create a query to count the number of distinct products sold in the past week.
24. Write a query to find the top 10 customers with the highest total order amount.