TAILIEUCHUNG - Enhanced Entity-Relationship, UML Modeling 1

Collection of similar entities or concepts into a higher level concept. EMPLOYEE class collects all employees into one class A class has properties called “class properties”. EMPLOYEE class has class properties - ., average salary, total number of employees. Each member has values for own properties (. name, address, salary): called member properties. | Enhanced Entity-Relationship and UML Modeling Enhanced-ER (EER) Model Concepts Includes all modeling concepts of basic ER Additional concepts: subclasses/superclasses, specialization/generalization, categories, attribute inheritance The resulting model is called the enhanced-ER or Extended ER (E2R or EER) model It is used to model applications more completely and accurately if needed It includes some object-oriented concepts, such as inheritance Subclasses and Superclasses (1) An entity type may have additional meaningful subgroupings of its entities Example: EMPLOYEE may be further grouped into SECRETARY, ENGINEER, MANAGER, TECHNICIAN, SALARIED_EMPLOYEE, HOURLY_EMPLOYEE, Each of these groupings is a subset of EMPLOYEE entities Each is called a subclass of EMPLOYEE EMPLOYEE is the superclass for each of these subclasses These are called superclass/subclass relationships. Example: EMPLOYEE/SECRETARY, EMPLOYEE/TECHNICIAN Subclasses and Superclasses (2) These are also called IS-A .

• Cơ sở dữ liệu
• Classification Abstraction
• Aggregation Abstraction
• Generalization Abstraction
• Cardinality Constraints
• Participation Constraints
• RAISINS
• CLASSIFICATION CURRANTS
• LEXICAL CONTEXT PRIMING ABSTRACTION
• báo cáo khoa học
• mô hình ngôn ngữ
• xử lý ngôn ngữ tự nhiên
• BMC Bioinformatics
• Feature engineering
• Supervised machine learning
• Distinguishing healthy
• Taxonomic abstraction
• Rural youth
• Agricultural activities
• Patan block of Jabalpur district
• Analyzing different categories
• Constraints faced
• Rural youth regarding participation