SQL Quest › SQL Interview Questions › Aggregation & Grouping
High-Volume Categories (HAVING)
A merchandising dashboard wants product categories with more than 10 orders. Show category and order_count. Group by category, filter with **HAVING COUNT(*) > 10**. Order by order_count descending.
Classic Easy HAVING: group, count, threshold. Don't confuse with WHERE — the count doesn't exist until aggregation, so the filter has to come *after* in HAVING.
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Schema
orders
| order_id | customer_id | product | category | quantity | price | total | order_date | country | status |
|---|---|---|---|---|---|---|---|---|---|
| 1 | 1 | Laptop Pro | Electronics | 1 | 1299.99 | 1299.99 | 2024-01-15 | USA | completed |
| 2 | 2 | Wireless Mouse | Electronics | 2 | 49.99 | 99.98 | 2024-01-16 | Canada | completed |
| 3 | 3 | Office Chair | Furniture | 1 | 349.99 | 349.99 | 2024-01-17 | USA | completed |
Expected output: Electronics, Furniture (Books filtered out)
Hint
SELECT, GROUP BY, HAVING, and open the hint there if you stall.Concepts
SELECT GROUP BY HAVING COUNT
Practise the topic: SQL practice questions · GROUP BY exercises
Read the concept: How to find duplicates in SQL
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