4 Data models A collection of tools for describing data data relationships data semantics data constraints Entity-Relationship model Relational model Other models object-oriented model, object-relational data model semi-structured data models Older models: network model and hierarchical mode Database System Concepts 1.11 OSilberschatz. Korth and SudarshanDatabase System Concepts 1.11 ©Silberschatz, Korth and Sudarshan 4 Data Models A collection of tools for describing data data relationships data semantics data constraints Entity-Relationship model Relational model Other models: object-oriented model、object-relational data model semi-structured data models Older models: network model and hierarchical model