One-to-many (data model)

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) A and B in which an element of A may be linked to many elements of B, but a member of B is linked to only one element of A. For instance, think of A as books, and B as pages. ^[1]

7 relations: Cardinality (data modeling), Entity, Entity–relationship model, Many-to-many (data model), One-to-one (data model), Relational database, Systems analysis.

Cardinality (data modeling)

In database design, the cardinality or fundamental principle of one data aspect with respect to another is a critical feature.

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Entity

An entity is something that exists as itself, as a subject or as an object, actually or potentially, concretely or abstractly, physically or not.

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Entity–relationship model

An entity–relationship model (ER model for short) describes interrelated things of interest in a specific domain of knowledge.

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Many-to-many (data model)

In systems analysis, a many-to-many relationship is a type of cardinality that refers to the relationship between two entities A and B in which A may contain a parent instance for which there are many children in B and vice versa.

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One-to-one (data model)

In systems analysis, a one-to-one relationship is a type of cardinality that refers to the relationship between two entities (see also entity–relationship model) A and B in which one element of A may only be linked to one element of B, and vice versa.

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Relational database

A relational database is a digital database based on the relational model of data, as proposed by E. F. Codd in 1970.

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Systems analysis

The Merriam-Webster dictionary defines system analysis as "the process of studying a procedure or business in order to identify its goals and purposes and create systems and procedures that will achieve them in an efficient way".

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Redirects here:

Many-to-one, One-to-Many (data model).

References

[1] https://en.wikipedia.org/wiki/One-to-many_(data_model)

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