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What is a referential integrity constraint in the context of relational databases?

原文 2019-09-18 20:56:53 5 0 database/ relational-database/ relational-algebra/ referential-integrity

The way I understand it, in the context of relational databases, a database has referential integrity if all referenced attribute values exist. In other words, if a value of one attribute references a value of another attribute, then the referenced value must exist. However, I cannot find any clear definition of referential integrity constraints . What exactly is a referential integrity constraint?

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