# Relational Data Modeling - One-to-One Relationship

A one-to-one relationship is a relational relationship that is equivalent to the set bijection relationship

This relationship describe that one row from a relation point to exactly one row to the other relation.

## Modeling

There are severals way to model a one-to-one relationship:

As a relation itself is a one-to-one relational structure, it means that the two relation (tables) could also be merge in one.

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Data Vault - Satellite

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Dimensional Data Modeling - Degenerate Dimension of Fact dimension (i.e. event/header entity)

In a dimensional model, you may find a dimension table: with a cardinality (distinct value is higher than 10,000). cardinality which has a many-to-one relationship with the fact table close to a one-to-one...
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Linear Algebra - Function (Set)

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In mathematics, especially in set theory, two ordered sets X,Y are said to have the same order type just when they are order isomorphic, that is, when there exists a bijection f: X → Y such that both...
Relational Data Modeling - Association Table (Bridge, Cross)

An association table (bridge table) is a table that permits to implement: one-to-one relationship or many-to-many relationship Because most of database only support one-to-many relationships, it...
Relational Data Modeling - Cardinality

The cardinality is way to define the relationship between two relation in a data model : one-to-one optional on one side one-to-one one-to-many many-to-many ... Cardinalities further describe...
Relational Data Modeling - Relationship

This page is relationship in a relational model. relation (generally a table) an entity or a relationship cardinality define the type of relationships between two relations. third junction table...
Web - Browser Fingerprinting

A digital fingerprint is a string that represents a unique id of a device (browser). The more unique is the browser, the more it has a one on one relationship with a user. A digital fingerprint may...