Programming tutorials for people who want code that actually runs, not code that only looks right. Pick a language, start at the beginning, and don't skip the basics. They are where most problems come from.
Window functions, CTEs and schema design for tables other people also write to. You will join three tables without double counting, rank and total rows with window functions, design tables that protect themselves, and read a query plan to see why a query is slow. If you skip the checks on duplicates, time zones and concurrent changes, your queries will pass on test data and give wrong answers on real data.
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