Natural key
A natural key (also known as business key or domain key) is a type of unique key in a database formed of attributes that exist and are used in the external world outside the database (i.e. in the business domain or domain of discourse). In the relational model of data, a natural key is a candidate key and is therefore a functional determinant for all attributes in a relation. Examples of natural keys could include:
* Purchase order number
* Flight number
* Login name
* Vehicle registration number
* Social Security number
* Passport number
* University ID number
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Natural key
A natural key (also known as business key or domain key) is a type of unique key in a database formed of attributes that exist and are used in the external world outside the database (i.e. in the business domain or domain of discourse). In the relational model of data, a natural key is a candidate key and is therefore a functional determinant for all attributes in a relation. Examples of natural keys could include:
* Purchase order number
* Flight number
* Login name
* Vehicle registration number
* Social Security number
* Passport number
* University ID number
has abstract
A natural key (also known as b ...... h may be natural or surrogate.
@en
Dans le domaine des bases de d ...... didates pour indexer une base.
@fr
Una clave natural que también ...... atributos dentro de una fila.
@es
在关系型数据库设计中，业务主键是一个由以及真实存在于世界中的 ...... street_address）到主键中以提高唯一性来克服。
@zh
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subject
hypernym
comment
A natural key (also known as b ...... number
* University ID number
@en
Dans le domaine des bases de d ...... didates pour indexer une base.
@fr
Una clave natural que también ...... atributos dentro de una fila.
@es
在关系型数据库设计中，业务主键是一个由以及真实存在于世界中的 ...... 这点是可以被验证的，因为业务主键是基于对真实世界的观察结果。
@zh
label
Clave natural
@es
Clé naturelle
@fr
Natural key
@en
Sprechender Schlüssel
@de
业务主键
@zh