関係 (データベース)
1. Relation (database)In relational model: A relation is a data structure which consists of a heading and an unordered set of tuples which share the same type. When Edgar F. Codd invented the relational model, he generalized the concept of binary relation (mathematical relation) to n-ary relation. Relation is a fundamental concept in relational model. A relation has zero or more tuples. A relation value is an instance of a relation. A relation variable (relvar) is a variable which has a relation value.
Read “Relation (database)” on English Wikipedia
Read “関係 (データベース)” on Japanese Wikipedia
Read “Relation (database)” on DBpedia
Read “Relation (database)” on English Wikipedia
Read “関係 (データベース)” on Japanese Wikipedia
Read “Relation (database)” on DBpedia
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