@hackproduct9: 24 nodes from your first SELECT to production-grade SQL. Most people learn SQL like a phrasebook — memorize JOIN syntax, hope for the best. But SQL is a path, and the order matters: aggregation before joins, joins before subqueries, all of it before analytics. Three tiers light up in the reel: fundamentals (single table + aggregation), intermediate (joins & transformations), advanced (set operations, date/time, production SQL). AI-engineer angle: SQL is the language your AI assistant writes most confidently — and most wrongly. UNION vs UNION ALL, LEFT JOIN rows silently dropped by a WHERE, NULLs eating your COUNT. You can only catch those bugs at the tier where you stopped climbing. Save this as your checklist. Which node are you on right now? #HackProduct #codevisuals #coding #visuals #algorithms #SQL #dataengineering #AIEngineering #datacareers

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