SQL in 30 Days 🚀 | Day 25: SQL Transactions Explained — COMMIT, ROLLBACK & ACID
Welcome to Day 25 of SQL in 30 Days 🚀
What happens when a database operation fails halfway through?
Imagine transferring ₹1,000 from one bank account to another. The money is deducted from one account, but the second operation fails.
Should the database keep the first change?
No. That's where SQL transactions come in.
In this video, you'll learn:
✅ What is a SQL Transaction?
✅ START TRANSACTION
✅ COMMIT
✅ ROLLBACK
✅ SAVEPOINT
✅ ROLLBACK TO SAVEPOINT
✅ Autocommit
✅ Transactions with INSERT
✅ Transactions with UPDATE
✅ Transactions with DELETE
✅ ACID properties
✅ Atomicity
✅ Consistency
✅ Isolation
✅ Durability
✅ Isolation levels
✅ Dirty reads
✅ Non-repeatable reads
✅ Phantom reads
✅ Real-world banking examples
✅ E-commerce transaction examples
✅ Common transaction mistakes
✅ Practical SQL challenges
The key idea:
START → OPERATE → COMMIT OR ROLLBACK
And remember:
ACID = Atomicity + Consistency + Isolation + Durability
📌 Previous: Day 24 — SQL Indexes
📌 Today: Day 25 — SQL Transactions
📌 Next: Day 26 — Stored Procedures & Functions
You're now 25 days into the SQL journey! 🔥
💬 QUESTION:
If a bank transfer succeeds on one side but fails on the other, what should happen?
Drop your answer in the comments 👇
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