Beyond the happy path — how to stop your database from lying to you

Gabor Koos at MotherDuck is writing about something that happens when the happy path is smooth but the real world is not: your database tells you one story while the actual data tells another. The article is about the craft of writing SQL that survives contact with production — edge cases, nulls, joins that multiply rows, timestamps that don't line up, the stuff that breaks a query once the data is real.

This is the kind of writing that matters for anyone who has ever written a query that works on the sample data and then explodes on the full table. It is not about a new tool, a new version, or a vendor pitch. It is about the skill of writing SQL that does what it says when the data is messy, which is always.

Why this matters for us: la gente who run side businesses and handle the numbers themselves — the bodeguera tracking inventory, the cousin doing his own books — need queries that work on real data, not demo data, and this is that kind of writing.