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PIVOT Operator in T-SQL

SQLmedium0.4 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
Kaseya
Key Concepts Tested
sql
Expert AnswerPremium
71 wordsInterview-ready
T-SQL PIVOT: rotates rows to columns. SELECT * FROM (SELECT product, region, sales FROM raw) t PIVOT (SUM(sales) FOR region IN ([North],[South],[East],[West])) pvt. Requires aggregation. UNPIVOT does reverse. Best: ensure known column set or use dynamic SQL for variable columns. **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....
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