Restructure Week 9 practice exercises & add Exercise 8 (fan-out)#33
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…c sample, assignment cast note Polish from a Week 9 exercise review (all solutions live-verified against the shared Azure Postgres: Manhattan top, 0 NULL pickups, 189 duplicate groups, 0 orphans, fact view 56,369 = 56,551 - 182 negatives). - Ex1: add ORDER BY pickup_datetime before LIMIT 5 so the sample is stable between runs (a bare LIMIT returns an arbitrary 5 rows). - Ex5: tell students 5a returns 0 and 5c returns empty BY DESIGN (pickup IDs are complete; orphans do not exist on this load). A 0 is the check passing, not a mistake. Prevents the "did I break it?" confusion. - Ex6: note the practice view is scaled down; the assignment's vw_fact_trips also casts pickup_datetime::TIMESTAMP. Flag it so students do not under-build the assignment deliverable. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
…k 9 exercise solutions
…ercises, and add Exercise 8 (Deduplicate Fan-out Join)
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This PR restructures the Week 9 practice exercises, moves the EXPLAIN/Cartesian query exercise to Exercise 5, shifts the validation and views exercises, and introduces a new Exercise 8 on identifying and resolving join fan-out in SQL.