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- Data_domain abstract "In data management and database analysis, a data domain refers to all the unique 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 wikiPageRevisionID "580263249".
- Data_domain hasPhotoCollection Data_domain.
- Data_domain subject Category:Data_modeling.
- Data_domain comment "In data management and database analysis, a data domain refers to all the unique 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 label "Домен (базы данных)".
- Data_domain label "定義域 (データベース)".
- Data_domain sameAs 定義域_(データベース).
- Data_domain sameAs m.0cz2mj.
- Data_domain sameAs Q2385774.
- Data_domain sameAs Q2385774.
- Data_domain wasDerivedFrom Data_domain?oldid=580263249.
- Data_domain isPrimaryTopicOf Data_domain.