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SQL Query: Group Employees by Technology and Order by ID

SQLeasy0.4 min readPremium
Frequency
Low
Asked at 1 company
Category
487
questions in SQL
Difficulty Split
130E|271M|86H
in this category
Total Bank
1,863
across 7 categories
Asked at these companies
Verizon
Key Concepts Tested
sql
Expert AnswerPremium
74 wordsInterview-ready
Group by tech, order by ID: SELECT technology, STRING_AGG(CAST(id AS VARCHAR) ORDER BY id) AS ids, ARRAY_AGG(id ORDER BY id) FROM employees GROUP BY technology ORDER BY MIN(id). Or: SELECT technology, LISTAGG(id, ',') WITHIN GROUP (ORDER BY id) FROM employees GROUP BY technology. **Why it matters**: Design choices compound at scale—wrong approach can cause 100× overhead. **Scalability trade-offs**: Profile before optimizing; validate on sample then full....
The complete answer continues with detailed implementation patterns, architectural trade-offs, and production-grade considerations. It covers performance optimization strategies, common pitfalls to avoid, and real-world examples from companies like Verizon. The answer also includes follow-up discussion points that interviewers commonly explore.

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