EMCS 6th batch

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20/11/2014
Judge yourself
20/11/2014

Judge yourself

Recursive-Relationship-ER-Diagrams
19/11/2014

Recursive-Relationship-ER-Diagrams

Cardinality-ER-Diagrams
19/11/2014

Cardinality-ER-Diagrams

Multivalued-Attribute-ER-Diagrams
19/11/2014

Multivalued-Attribute-ER-Diagrams

19/11/2014

Entity

An entity can be a person, place, event, or object that is relevant to a given system. For example, a school system may include students, teachers, major courses, subjects, fees, and other items. Entities are represented in ER diagrams by a rectangle and named using singular nouns.

Weak Entity
A weak entity is an entity that depends on the existence of another entity. In more technical terms it can defined as an entity that cannot be identified by its own attributes. It uses a foreign key combined with its attributed to form the primary key. An entity like order item is a good example for this. The order item will be meaningless without an order so it depends on the existence of order.

ER Diagram Symbols and Notations
19/11/2014

ER Diagram Symbols and Notations

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