Database Diagram Arrows Meaning. A data flow diagram dfd maps out the flow of information for any process or system. By nature it is an abstract visualization the first step in the design process towards creating a logical and functional database.
See flowchart s symbols by specifics of process flow diagram symbols and. Name of the entity is written inside. Generalization means that the specializing or derived type inherits attributes operations and associations of the general or base type.
Rectangles are used to represent the entity in the diagram.
Entity relationship diagram screens the interactions of entity established stored in a database. Rectangles are used to represent the entity in the diagram. Creating an entity relationship er model is to visually represent the structure of a business database where data equates to entities or objects that are linked by defined relationships expressing dependencies and requirements. Generalization means that the specializing or derived type inherits attributes operations and associations of the general or base type.
