Cardinality refers to the relationship between tables in a database. Represented in 1:1, 1:N, and N:M, it refers to how many instances of one entity can be associated with instances of another database entity. Cardinality is important because it helps ensure the integrity and consistency of the data in the database.
It describes the number of instances of one entity that can be associated with one, none, or many instances of another entity in a database. one-to-one relationship, “1:N“ for a one-to-many relationship, and “N:M“ for a many-to-many relationship.
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