実体完全性
1. Entity integrityIn the relational data model, entity integrity is one of the three inherent integrity rules. Entity integrity is an integrity rule which states that every table must have a primary key and that the column or columns chosen to be the primary key should be unique and not null. Within relational databases using SQL, entity integrity is enforced by adding a primary key clause to a schema definition.
Read “Entity integrity” on English Wikipedia
Read “実体完全性” on Japanese Wikipedia
Read “Entity integrity” on DBpedia
Read “Entity integrity” on English Wikipedia
Read “実体完全性” on Japanese Wikipedia
Read “Entity integrity” on DBpedia
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