Deliverable | Must contain | The failure mode to avoid |
|---|---|---|
1. The precise question | The vague version and the precise, queryable version, side by side, following the Lesson 4.2 framework | Writing queries before pinning down what "correct" means for every term involved (active, churned, converted) |
2. The query set | At least three real queries: one simple filter/count, one aggregation with GROUP BY, and one either a funnel, a cohort, or a window-function trend | Copying a query pattern from this course without adapting the logic to your actual schema and actual definitions |
3. A sanity-check log | For each query, one sentence on how you verified the number using the Lesson 4.1 checklist | Presenting a number you ran once and never independently checked |
4. The decision memo | One paragraph: what this data shows, what decision it should inform, and what you'd still want to know before acting on it | Treating correlation as causation, or presenting a single number without its comparison baseline |