Super key: Any column set that uniquely identifies a row; can have redundant cols. Minimal super key = candidate key. Composite key: Multi-column key, e.g. (order_id, line_item_id). PK can be composite. Super key is broader; composite is a type....
This easy-level General/Other question appears frequently in data engineering interviews at companies like ZS Associates. While less common, it tests deeper understanding that distinguishes strong candidates.
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.
Super key: Any column set that uniquely identifies a row; can have redundant cols. Minimal super key = candidate key. Composite key: Multi-column key, e.g. (order_id, line_item_id). PK can be composite. Super key is broader; composite is a type. Choose minimal candidate as PK.
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Analyze My Answer — FreeAccording to DataEngPrep.tech, this is one of the most frequently asked General/Other 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.