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Introduction to CASE WHEN
Categorize movies into eras: 'Classic' (year < 2000), 'Modern' (2000-2009), 'Recent' (2010+). For each era, show era, movie_count, avg_rating (2 dec), and avg_revenue (2 dec). Sort by era. CASE WHEN is SQL's if/else — it creates new categories from existing data.
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Schema
movies
| id | title | year | genre | rating | votes | revenue_millions | runtime | director |
|---|---|---|---|---|---|---|---|---|
| 1 | Guardians of the Galaxy | 2014 | Action | 8.1 | 757074 | 333.13 | 121 | James Gunn |
| 2 | Prometheus | 2012 | Adventure | 7 | 485820 | 126.46 | 124 | Ridley Scott |
| 3 | Split | 2016 | Horror | 7.3 | 157606 | 138.12 | 117 | M. Night Shyamalan |
Expected output: 3 rows, one per era with aggregated stats
Hint
Concepts
SELECT CASE GROUP BY Aggregation
Practise the topic: SQL practice questions · CASE WHEN practice · GROUP BY exercises
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