📚 Overview This repository contains production-grade SQL schemas and curated exam questions designed to help you master Oracle SQL. Whether you're preparing for Oracle certifications (OCP, 1Z0-071) ...

The skills are vendor-neutral. They teach the standard spelling of each feature, name the correctness traps that LLMs reliably fall into, and map portability per feature across PostgreSQL, ...

SQL shows up in almost every backend and full-stack interview. Not just basic SELECT queries. Interviewers want to know if you understand what's happening underneath. Here's what actually gets tested: ...