17+ Entity Relationship Diagram Cardinality
In database management, cardinality represents the number of times an entity of an entity set participates in a relationship set. Or we can say that the cardinality of a relationship is the number of tuples (rows) in a relationship. Within data modelling, cardinality is the numerical relationship between rows of one table and rows in another. Common cardinalities include one-to-one, one-to-many, and many-to-many. Learn what cardinality means in databases, including column and relationship cardinality, examples and how it impacts indexing and query performance....