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- key_normal_form abstract "Domain/key normal form (DKNF) is a normal form used in database normalization which requires that the database contains no constraints other than domain constraints and key constraints.A domain constraint specifies the permissible values for a given attribute, while a key constraint specifies the attributes that uniquely identify a row in a given table.The domain/key normal form is achieved when every constraint on the relation is a logical consequence of the definition of keys and domains, and enforcing key and domain restraints and conditions causes all constraints to be met. Thus, it avoids all non-temporal anomalies. The reason to use domain/key normal form is to avoid having general constraints in the database that are not clear domain or key constraints. Most databases can easily test domain and key constraints on attributes. General constraints however would normally require special database programming in the form of stored procedures that are expensive to maintain and expensive for the database to execute. Therefore general constraints are split into domain and key constraints.It's much easier to build a database in domain/key normal form than it is to convert lesser databases which may contain numerous anomalies. However, successfully building a domain/key normal form database remains a difficult task, even for experienced database programmers. Thus, while the domain/key normal form eliminates the problems found in most databases, it tends to be the most costly normal form to achieve. However, failing to achieve the domain/key normal form may carry long-term, hidden costs due to anomalies which appear in databases adhering only to lower normal forms over time.The third normal form, Boyce–Codd normal form, fourth normal form and fifth normal form are special cases of the domain/key normal form. All have either functional, multi-valued or join dependencies that can be converted into (super)keys. The domains on those normal forms were unconstrained so all domain constraints are satisfied. However, transforming a higher normal form into domain/key normal form is not always a dependency-preserving transformation and therefore not always possible.".
- key_normal_form wikiPageExternalLink normalization.htm.
- key_normal_form wikiPageExternalLink intro-to-normalization.html.
- key_normal_form wikiPageExternalLink nf3.
- key_normal_form wikiPageExternalLink 283878.
- key_normal_form wikiPageExternalLink tods81.pdf.
- key_normal_form wikiPageExternalLink rm7.html.
- key_normal_form wikiPageID "6867370".
- key_normal_form wikiPageRevisionID "544531683".
- key_normal_form hasPhotoCollection key_normal_form.
- key_normal_form subject Category:Database_normalization.
- key_normal_form comment "Domain/key normal form (DKNF) is a normal form used in database normalization which requires that the database contains no constraints other than domain constraints and key constraints.A domain constraint specifies the permissible values for a given attribute, while a key constraint specifies the attributes that uniquely identify a row in a given table.The domain/key normal form is achieved when every constraint on the relation is a logical consequence of the definition of keys and domains, and enforcing key and domain restraints and conditions causes all constraints to be met. ".
- key_normal_form label "Domain/key normal form".
- key_normal_form label "Forma normal de dominio/clave".
- key_normal_form label "Доменно-ключевая нормальная форма".
- key_normal_form sameAs clave.
- key_normal_form sameAs m.0gtcr8.
- key_normal_form sameAs Q4165818.
- key_normal_form sameAs Q4165818.
- key_normal_form wasDerivedFrom key_normal_form?oldid=544531683.
- key_normal_form isPrimaryTopicOf key_normal_form.