What Is Canonical Cover and Why It Matters in DBMS Interviews

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Canonical Cover is a key concept in Database Management Systems (DBMS) that focuses on simplifying sets of functional dependencies without losing any constraints. It sits within the database design roadmap, bridging the gap between understanding functional dependencies and performing normalization. Before tackling Canonical Cover, learners are expected to be familiar with attributes, functional dependencies, attribute closure, and candidate keys, as these concepts build sequentially on one another. In software engineering interviews, candidates are typically tested not on memorizing the algorithm but on whether they grasp why redundant or unnecessary dependency rules should be eliminated. The core idea is that a well-designed schema should represent business rules using the fewest and simplest rules possible, reflecting principles of correctness, simplicity, and maintainability.

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