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Oracle SQL expertise commands respect in enterprise environments. Master fundamentals, performance tuning, and PL/SQL with the best 2026 courses, free resources, GitHub repos, and communities.
Advanced SQL is where database work gets interesting — and where most tutorials stop. Here's the curated guide to window functions, CTEs, query optimization, and the courses and free resources that actually take you from competent to expert.
Database design is the skill most developers skip — and the one that causes the most expensive problems later. Here are the best courses, free resources, GitHub repos, and tools to learn it properly.