If you have ever written a complex SQL query involving rankings, running totals, moving averages, top-N records, or comparing rows within the same dataset, chances are you have faced difficult joins, ...

📚 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) ...

An end-to-end data analytics case study demonstrating data engineering (synthesis, cleaning, and preparation), relational database modeling (SQL, schema design, and analytical querying), and business ...