A small SQL problem with a big impact: latest row per customer

Ever needed the most recent record per group and ended up with duplicates or slow queries? Here are clean, reliable patterns (window functions + fallback) you can use in production.

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SQL anti-join patterns: finding missing rows without surprises

Need records that exist in one table but not another? Here are safe anti-join options, when to use each, and how to avoid null and duplicate pitfalls.

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Power BI modeling checklist: from raw files to reliable insights

A practical checklist for shaping data, defining measures, and building a model that stays fast and trustworthy as your dataset grows.

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