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参照完整性

参照完整性,又称引用完整性,是数据的属性,用以表明引用有效。参照的完整性不允许关系中有不存在的实体引用。[1]参照完整性与实体完整性二者,皆是关系模型必须满足的完整性约束条件,其目的在于保证数据一致性

参考链接 编辑

  1. ^ Mike Chapple. Referential Integrity. About.com. [2011-03-20]. (原始内容于2016-11-19). Definition: Referential integrity is a database concept that ensures that relationships between tables remain consistent. When one table has a foreign key to another table, the concept of referential integrity states that you may not add a record to the table that contains the foreign key unless there is a corresponding record in the linked table. 


参照完整性, 又称引用完整性, 是数据的属性, 用以表明引用之有效, 参照的完整性不允许关系中有不存在的实体引用, 与实体完整性二者, 皆是关系模型必须满足的完整性约束条件, 其目的在于保证数据一致性, 参考链接, 编辑, mike, chapple, referential, integrity, about, 2011, 原始内容存档于2016, definition, referential, integrity, database, concept, that, ensures, that, relatio. 参照完整性 又称引用完整性 是数据的属性 用以表明引用之有效 参照的完整性不允许关系中有不存在的实体引用 1 参照完整性与实体完整性二者 皆是关系模型必须满足的完整性约束条件 其目的在于保证数据一致性 参考链接 编辑 Mike Chapple Referential Integrity About com 2011 03 20 原始内容存档于2016 11 19 Definition Referential integrity is a database concept that ensures that relationships between tables remain consistent When one table has a foreign key to another table the concept of referential integrity states that you may not add a record to the table that contains the foreign key unless there is a corresponding record in the linked table 取自 https zh wikipedia org w index php title 参照完整性 amp oldid 62140024, 维基百科,wiki,书籍,书籍,图书馆,

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