SQL Tutorial - Full Database Course for Beginners

Part1- Database Testing Overview | Backend Testing | Practical Approach

2-Build RAG Pipeline From Scratch-Data Ingestion to Vector DB Pipeline-Part 1

S-Line Filter: Edit Database

System Design: Building a Bulletproof Payment Gateway! 🚀 Basic payment setups fail during network timeouts. To block catastrophic duplicate charges, enforce client-generated idempotency keys (UUIDs). The server saves this key first; if a duplicate request arrives, it immediately returns the cached result instead of re-charging the buyer. Never overwrite database rows to update payment statuses. Instead, implement an immutable ledger where every state change—authorized, captured, or refunded—cre