Computer Sciene of Udayana State University

April 18, 2009

ERD(ENTITY RELATIONAL DIAGRAM)

Filed under: Computer Science — ignaga @ 11:28 AM

In software engineering, an Entity-Relationship Model (ERM) is an abstract and conceptual representation of data. Entity-relationship modeling is a database modeling method, used to produce a type of conceptual schema or semantic data model of a system, often a relational database, and its requirements in a top-down fashion.

What’s Differences between DFD (DATA FLOW DIAGRAM) and ERD(ENTITY RELATIONAL DIAGRAM)?

· DFDs show the flow of data from external entities into the system, showed how the data moved from one process to another, as well as its logical storage. Where as

The ERD, which represents the entity model, shows what the database or system will look like but doesn’t explain how to implement it. An ERD is vendor-neutral. It groups data into entities and relates the entities to one another based on business rules. An entity is something that has substance and about which you want to store data. A business rule is a policy or procedure that a business enforces. It describes how the business operates

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    Comment by qxayho — April 30, 2009 @ 9:11 PM | Reply


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