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In the relational data model, data is organized into tables called relations. Each relation consists of rows, known as tuples, and columns, known as attributes. The relational model provides concepts and operations that help maintain data accuracy, consistency, and efficient retrieval. Candidate key, functional dependency, referential integrity, selection, and projection are important concepts used in database design and data analysis. A Candidate Key is an attribute or a combination of attributes that can uniquely identify every tuple in a relation. A relation may have more than one candidate key, but one of them is selected as the primary key. A candidate key must satisfy two conditions: uniqueness and minimality. Uniqueness means that no two _______ ____ ___ __________ ________ ____ ____ __________ ___ ________ ____.
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