🔥 4 Most Asked SQL Theoretical Interview Questions 🔥

❓ 1. What is the difference between WHERE and HAVING?

✅ WHERE filters rows before aggregation.
✅ HAVING filters groups after aggregation.

💡 WHERE → Rows | HAVING → Groups

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❓ 2. What is the difference between RANK(), DENSE_RANK(), and ROW_NUMBER()?

✅ ROW_NUMBER() → Unique number for each row
✅ RANK() → Skips ranks after ties
✅ DENSE_RANK() → No skipped ranks after ties

💡 A favorite topic in SQL interviews.

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❓ 3. What is a CTE?

✅ CTE (Common Table Expression) is a temporary result set created using the WITH clause.

💡 Helps make complex queries cleaner and easier to understand.

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❓ 4. What is the difference between DELETE, TRUNCATE, and DROP?

🗑️ DELETE → Removes selected rows
⚡ TRUNCATE → Removes all rows
💥 DROP → Removes the entire table

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