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Cardinality in database management refers to the number of times an entity participates in a relationship, which is crucial for understanding data connections and uniqueness. The document outlines different types of cardinality: one-to-one, one-to-many, many-to-one, and many-to-many, along with examples from a hospital and a company. It also discusses the role of associative entities in resolving many-to-many relationships and optimizing database design.
- Author
- ramish.sadiq
- Language
- EN