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List customers with more than 5 orders.

Python/Codingmedium0.6 min readPremium
Frequency
Low
Asked at 1 company
Category
179
questions in Python/Coding
Difficulty Split
127E|24M|28H
in this category
Total Bank
1,863
across 7 categories
Asked at these companies
Comcast
Key Concepts Tested
joinpartitionspark
Expert AnswerPremium
115 wordsInterview-ready
**Why HAVING vs WHERE:** WHERE filters before aggregation; HAVING after. For 'more than 5 orders,' you must aggregate first—HAVING is correct. Using WHERE with a subquery is an alternative but less clear. **Scalability:** (1) Index customer_id, order_id—enables index-only scan for COUNT. (2) For billions of rows: pre-aggregate in a summary table (customer_order_counts) refreshed incrementally....
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