SELECT student_id, student_name, SUM(marks) AS total_marks FROM students GROUP BY student_id, student_name ORDER BY total_marks DESC. If only student_id: GROUP BY student_id. **Why**: Include all non-aggregated columns in GROUP BY; use meaningful aliases....
This easy-level SQL question appears frequently in data engineering interviews at companies like Gartner. While less common, it tests deeper understanding that distinguishes strong candidates. Mastering the underlying concepts (sql) will help you answer variations of this question confidently.
Start by clearly defining the core concept being asked about. Interviewers want to see that you understand the fundamentals before diving into implementation details. Structure your answer with a definition, then explain the practical application with a concise example.
SELECT student_id, student_name, SUM(marks) AS total_marks FROM students GROUP BY student_id, student_name ORDER BY total_marks DESC. If only student_id: GROUP BY student_id. Why: Include all non-aggregated columns in GROUP BY; use meaningful aliases. Production nuance: For large tables, consider pre-aggregated marts; ensure student_id is indexed.
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Analyze My Answer — FreeAccording to DataEngPrep.tech, this is one of the most frequently asked SQL interview questions, reported at 1 company. DataEngPrep.tech maintains a curated database of 1,863+ real data engineering interview questions across 7 categories, verified by industry professionals.