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Generate ML labels in SQL: did each user churn (no activity in the next 30 days)?

Defining the label is half the modeling problem, and the SQL hides two leakage traps: looking into the future for features, and a label window that isn't fully observed yet. Here is the correct query.

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

Defining the label is half the modeling problem, and the SQL hides two leakage traps: looking into the future for features, and a label window that isn't fully observed yet. Here is the correct query.

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