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SQL Query for Best of 3 Marks and Average in a Student Table

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
Nagarro
Key Concepts Tested
partitionsql
Expert AnswerPremium
83 wordsInterview-ready
Best 3 marks + average: WITH top3 AS (SELECT student_id, mark, ROW_NUMBER() OVER (PARTITION BY student_id ORDER BY mark DESC) rn FROM marks) SELECT student_id, SUM(mark)/3 AS best3_avg FROM top3 WHERE rn <= 3 GROUP BY student_id. Or use SUM with conditional: SUM(CASE WHEN rn<=3 THEN mark END)/3. For overall average: AVG(mark). **Why it matters**: Design choices compound at scale—wrong approach can cause 100× overhead....
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