INDEXING - HASHING - AND -QUERY

Mastering Indexing in SQL: B-Tree, B+Tree, and Hash Index Examples

Indexing is one of the most powerful ways to boost the performance of your SQL queries. In this tutorial, we’ll explore B-Tree, B+Tree, and Hash indexes step-by-step using a Students table example.

We’ll:
✅ Create a Students table
✅ Insert sample data
✅ Build three types of indexes
✅ Run queries using each index
✅ Observe how indexing improves retrieval speed

Create the Table

Insert Sample Records

Create a B-Tree Index on roll_no

Query Using the B-Tree Index

Query Using the B+ Tree Index

Query Using the Hash Index

Conclusion

In this blog, we learned how to:
-Create B-Tree, B+Tree, and Hash indexes
-Execute optimized queries
-Understand which index type fits which use case

Indexes make retrieval blazing fast but also consume storage and slow down updates slightly. So, always index wisely!