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How does an entity relationship diagram work? What is entity Relationship Diagram?

Entity Relationship Diagram

It is also possible to show the logical structure or relationships of a database using a block diagram, called an entity relationship diagram. It is much easier to understand the whole thing with the help of block diagram than to describe it in writing. There are some general rules to follow for expressing the database using block diagrams. Apart from that some symbols can be used. The symbols used carry special meanings.

Examples of Basic Symbols Used in NTT Relationship Diagrams--- Several symbols can be used to show the logical structure or relationships of a database using block diagrams as well. The symbols used carry special meanings. Some of the common symbols used in the NTT relationship model are---


Rectangle -- Set entity

Ellipse- attribute

Diamond -- Relationships

Straight line -- contains attributes and connectors of NTT sets and NTT sets.

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