P. P. Chen氏が提唱
– The Entity-Relationship Model - Toward a Unified View of Data (1976)
• 事物および事象を存在(entity)と作用(relationship)で記述する方法論
relationship
2022/3/26 14:10:00
P. P. Chen氏が提唱
– The Entity-Relationship Model - Toward a Unified View of Data (1976)
• 事物および事象を存在(entity)と作用(relationship)で記述する方法論