What is EER explain with example?

EER is a high-level data model that incorporates the extensions to the original ER model. Enhanced ERD are high level models that represent the requirements and complexities of complex database. In addition to ER model concepts EE-R includes − Subclasses and Super classes.

What are the examples of entity relationship model?

Examples: an employee entity might have a Social Security Number (SSN) attribute, while a proved relationship may have a date attribute. All entities except weak entities must have a minimal set of uniquely identifying attributes which may be used as a unique/primary key.

Where is EER used?

Energy efficiency ratio (EER) is used in the USA, and is defined as the system output in Btu/h per watt of electrical energy. Coefficient of performance (COP) is the equivalent measure using SI units, which is widely used in the UK. A COP of 1.0 equates to an EER of 3.4.

What is the main concept of EER?

The enhanced entity–relationship (EER) model (or extended entity–relationship model) in computer science is a high-level or conceptual data model incorporating extensions to the original entity–relationship (ER) model, used in the design of databases.

Why do we need EER?

Enhanced entity-relationship (EER) diagrams are basically an expanded upon version of ER diagrams. EER models are helpful tools for designing databases with high-level models. With their enhanced features, you can plan databases more thoroughly by delving into the properties and constraints with more precision.

What is relationship give example?

The definition of a relationship is a connection between two people or things. An example of relationship is a husband and his wife. An example of relationship is a brother and his sister. An example of relationship is two businesses working together. Connection by blood, marriage, etc.; kinship.

What is a good EER?

12 EER rating is an excellent energy-efficiency rating for an air conditioner. Some of the best devices can even reach more than 12 EER. The best mini split air conditioners have an extremely high 12+ EER rating (check them here).

What does EER stand for in data model?

EER is a high-level data model that incorporates the extensions to the original ER model. These concepts are used when the comes in EER schema and the resulting schema diagrams called as EER Diagrams.

Which is an example of an EER schema?

Chapter 8 Outline (cont’d.)   A Sample UNIVERSITY EER Schema, Design Choices, and Formal Definitions   Example of Other Notation: Representing Specialization and Generalization in UML Class Diagrams   Data Abstraction, Knowledge Representation, and Ontology Concepts Copyright © 2011 Ramez Elmasri and Shamkant Navathe

Who are the authors of the EER model?

  May be totalor partial   Disjointness and completeness constraints are independent Copyright © 2011 Ramez Elmasri and Shamkant Navathe Specialization and Generalization Hierarchies and Lattices   Specialization hierarchy

What is the extended entity relationship ( EER ) model?

he Extended Entity-Relationship (EER) model is a conceptual (or semantic) data model, capable of describing the datarequirements for a new information system in a direct and easy tounderstand graphical notation. ata requirements for a database are described in terms of a conceptual schema, using the EER model.