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- Data_domain abstract "In data management and database analysis, a data domain refers to all the values which a data element may contain. The rule for determining the domain boundary may be as simple as a data type with an enumerated list of values.For example, a database table that has information about people, with one record per person, might have a \"gender\" column. This gender column might be declared as a string data type, and allowed to have one of two known code values: \"M\" for male, \"F\" for female—and NULL for records where gender is unknown or not applicable (or arguably \"U\" for unknown as a sentinel value). The data domain for the gender column is: \"M\", \"F\".In a normalized data model, the reference domain is typically specified in a reference table. Following the previous example, a Gender reference table would have exactly two records, one per allowed value—excluding NULL. Reference tables are formally related to other tables in a database by the use of foreign keys.Less simple domain boundary rules, if database-enforced, may be implemented through a check constraint or, in more complex cases, in a database trigger. For example, a column requiring positive numeric values may have a check constraint declaring that the values must be greater than zero.This definition combines the concepts of domain as an area over which control is exercised and the mathematical idea of a set of values of an independent variable for which a function is defined. See: domain (mathematics).".
- Data_domain wikiPageID "4997190".
- Data_domain wikiPageLength "2372".
- Data_domain wikiPageOutDegree "32".
- Data_domain wikiPageRevisionID "684881075".
- Data_domain wikiPageWikiLink Category:Data_modeling.
- Data_domain wikiPageWikiLink Check_constraint.
- Data_domain wikiPageWikiLink Code_(metadata).
- Data_domain wikiPageWikiLink Column_(database).
- Data_domain wikiPageWikiLink Data_element.
- Data_domain wikiPageWikiLink Data_management.
- Data_domain wikiPageWikiLink Data_model.
- Data_domain wikiPageWikiLink Data_modeling.
- Data_domain wikiPageWikiLink Data_type.
- Data_domain wikiPageWikiLink Database.
- Data_domain wikiPageWikiLink Database_normalization.
- Data_domain wikiPageWikiLink Database_trigger.
- Data_domain wikiPageWikiLink Dependent_and_independent_variables.
- Data_domain wikiPageWikiLink Domain_of_a_function.
- Data_domain wikiPageWikiLink Enumeration.
- Data_domain wikiPageWikiLink Foreign_key.
- Data_domain wikiPageWikiLink Function_(mathematics).
- Data_domain wikiPageWikiLink Gender.
- Data_domain wikiPageWikiLink IEC_11179.
- Data_domain wikiPageWikiLink Master_data_management.
- Data_domain wikiPageWikiLink Null_(SQL).
- Data_domain wikiPageWikiLink Reference_table.
- Data_domain wikiPageWikiLink Relational_database.
- Data_domain wikiPageWikiLink Sentinel_value.
- Data_domain wikiPageWikiLink Set_(mathematics).
- Data_domain wikiPageWikiLink Table_(database).
- Data_domain wikiPageWikiLink Unique_key.
- Data_domain wikiPageWikiLinkText "Data domain".
- Data_domain wikiPageWikiLinkText "Domain''".
- Data_domain wikiPageWikiLinkText "Domains".
- Data_domain wikiPageWikiLinkText "data domain".
- Data_domain wikiPageWikiLinkText "data type".
- Data_domain wikiPageWikiLinkText "domain constraints".
- Data_domain wikiPageWikiLinkText "domain".
- Data_domain wikiPageUsesTemplate Template:Database-stub.
- Data_domain wikiPageUsesTemplate Template:Other_uses.
- Data_domain wikiPageUsesTemplate Template:Reflist.
- Data_domain subject Category:Data_modeling.
- Data_domain type Datum.
- Data_domain type Redirect.
- Data_domain comment "In data management and database analysis, a data domain refers to all the values which a data element may contain. The rule for determining the domain boundary may be as simple as a data type with an enumerated list of values.For example, a database table that has information about people, with one record per person, might have a \"gender\" column.".
- Data_domain label "Data domain".
- Data_domain sameAs Q2385774.
- Data_domain sameAs Datová_doména.
- Data_domain sameAs 定義域_(データベース).
- Data_domain sameAs Datu_domēns.
- Data_domain sameAs m.0cz2mj.
- Data_domain sameAs Домен_(базы_данных).
- Data_domain sameAs Домен_(бази_даних).
- Data_domain sameAs Q2385774.
- Data_domain wasDerivedFrom Data_domain?oldid=684881075.
- Data_domain isPrimaryTopicOf Data_domain.