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Detect feature drift in SQL: compare a feature's distribution between two time periods.

Production drift monitoring often lives in the warehouse, not a fancy tool. Comparing two distributions in SQL with a metric like PSI is a few CTEs. Here is how to compute it.

Updated Aug 2026 · Grounded in real Applied AI Engineer interview loops and written to a senior-engineer editorial bar.

Production drift monitoring often lives in the warehouse, not a fancy tool. Comparing two distributions in SQL with a metric like PSI is a few CTEs. Here is how to compute it.

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