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An entity–relationship model (or ER model) describes interrelated things of interest in a specific domain of knowledge. A basic ER model is composed of entity types (which classify the things of interest) and specifies relationships that can exist between entities (instances of those entity types).
Some researchers additionally require that the integers , , and be distinct from each other, as the Egyptians would have, while others allow them to be equal. [1] For , it does not matter whether they are required to be distinct: if there exists a solution with any three integers, then there exists a solution with distinct integers. [2]
The only known solution is 1 1 + 2 1 = 3 1, and Paul Erdős conjectured that no further solutions exist. Any further solutions must have m > 10 10 9. [1] Some care must be taken when comparing research papers on this equation, because some articles [2] express it in the form 1 k + 2 k + ⋯ + m k = (m + 1) k instead.
The enhanced entity–relationship (EER) model (or extended entity–relationship model) in computer science is a high-level or conceptual data model incorporating extensions to the original entity–relationship (ER) model, used in the design of databases.
An associative entity is a term used in relational and entity–relationship theory. A relational database requires the implementation of a base relation (or base table) to resolve many-to-many relationships. A base relation representing this kind of entity is called, informally, an associative table. An associative entity (using Chen notation)
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An entity–relationship model (ERM) is an abstract conceptual representation of structured data. Entity–relationship modeling is a relational schema database modeling method, used in software engineering to produce a type of conceptual data model (or semantic data model ) of a system, often a relational database , and its requirements in a ...
In systems analysis, a one-to-many relationship is a type of cardinality that refers to the relationship between two entities (see also entity–relationship model). For example, take a car and an owner of the car. The car can only be owned by one owner at a time or not owned at all, and an owner could own zero, one, or multiple cars.