✅ Basic SQL Queries Interview Questions With Answers 🖥️

1. What does SELECT do
– SELECT fetches data from a table
– You choose columns you want to see
Example: SELECT name, salary FROM employees;

2. What does FROM do
– FROM tells SQL where data lives
– It specifies the table name
Example: SELECT * FROM customers;

3. What is WHERE clause
– WHERE filters rows
– It runs before aggregation
Example: SELECT * FROM orders WHERE status = 'Delivered';

4. Difference between WHERE and HAVING
– WHERE filters rows before GROUP BY
– HAVING filters groups after aggregation
Example: WHERE filters orders, HAVING filters total_sales

5. How do you sort data
– Use ORDER BY
– Default order is ASC
Example: SELECT * FROM employees ORDER BY salary DESC;

6. How do you sort by multiple columns
– SQL sorts left to right
Example: SELECT * FROM students ORDER BY class ASC, marks DESC;

7. What is LIMIT
– LIMIT restricts number of rows returned
– Useful for top N queries
Example: SELECT * FROM products LIMIT 5;

8. What is OFFSET
– OFFSET skips rows
– Used with LIMIT for pagination
Example: SELECT * FROM products LIMIT 5 OFFSET 10;

9. How do you filter on multiple conditions
– Use AND, OR
Example: SELECT * FROM users WHERE city = 'Delhi' AND age > 25;

10. Difference between AND and OR
– AND needs all conditions true
– OR needs one condition true

Quick interview advice
• Always say execution order: FROM → WHERE → SELECT → ORDER BY → LIMIT
• Write clean examples
• Speak logic first, syntax next¹

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