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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. In mathematical terms, there exists a bijective function from A to B.For instance, think of A as the set of all human beings, and B as the set of all their brains. Any person from A can and must have only one brain from B, and any human brain in B can and must belong to only one person that is contained in A.

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  • One-to-one (data model)
  • Association un-à-un
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  • En gestion de base de données, une association de un-à-un détermine que pour chaque enregistrement d'une table, il ne peut y avoir que zéro ou un enregistrement d'une autre table qui lui soit lié. Il est intéressant d'utiliser ce type de relation pour cacher certaines données, pour utiliser des paramètres différents sur ces deux tables (par exemple un moteur de stockage différent dans MySQL), ... Ce type de relation peut toutefois être évitée. En effet, une relation de un à un peut souvent être éliminée et remplacée par la fusion des deux tables en relation.
  • 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. In mathematical terms, there exists a bijective function from A to B.For instance, think of A as the set of all human beings, and B as the set of all their brains. Any person from A can and must have only one brain from B, and any human brain in B can and must belong to only one person that is contained in A.
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  • En gestion de base de données, une association de un-à-un détermine que pour chaque enregistrement d'une table, il ne peut y avoir que zéro ou un enregistrement d'une autre table qui lui soit lié. Il est intéressant d'utiliser ce type de relation pour cacher certaines données, pour utiliser des paramètres différents sur ces deux tables (par exemple un moteur de stockage différent dans MySQL), ... Ce type de relation peut toutefois être évitée. En effet, une relation de un à un peut souvent être éliminée et remplacée par la fusion des deux tables en relation.
  • 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. In mathematical terms, there exists a bijective function from A to B.For instance, think of A as the set of all human beings, and B as the set of all their brains. Any person from A can and must have only one brain from B, and any human brain in B can and must belong to only one person that is contained in A. In a relational database, a one-to-one relationship exists when one row in a table may be linked with only one row in another table and vice versa. It is important to note that a one-to-one relationship is not a property of the data, but rather of the relationship itself. A list of mothers and their children may happen to describe mothers with only one child, in which case one row of the mothers table will refer to only one row of the children table and vice versa, but the relationship itself is not one-to-one, because mothers may have more than one child, thus forming a one-to-many relationship.
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