Kardinalitásnak

Kardinalitásnak is a Hungarian term that translates to "cardinality" in English, primarily used in the context of set theory and database design. In set theory, the cardinality of a set is a measure of the number of elements contained in that set. For finite sets, this is simply the count of its members. For infinite sets, cardinality is a more complex concept, often involving different "sizes" of infinity, as famously explored by Georg Cantor.

In database management, cardinality refers to the relationship between tables in a relational database. It describes how many records in one table can be related to records in another table. Common types of cardinality include one-to-one, one-to-many, and many-to-many relationships. Understanding cardinality is crucial for designing efficient and well-structured databases, as it dictates how data can be joined and queried. For instance, a one-to-many relationship means one record in a parent table can be associated with multiple records in a child table, but each record in the child table can only be associated with one record in the parent table. This concept helps in enforcing data integrity and optimizing database performance.