An entity relationship (ER) diagram visually represents how entities, such as people or objects, relate within a system and illustrates the overall logical structure of a database. The diagram employs various notations to express relationships and cardinality, making it a clear and simplified representation. ER diagrams, such as those depicting customer and loan interactions, are valuable for database representation.

1. ER DIAGRAMS
UNIT 1

2. • An Entity Relationship (ER) Diagram is a type of flowchart that
illustrates how “entities” such as people, objects or concepts relate to
each other within a system.
• The overall logical structure of a database can be expressed
graphically by E-R diagram.
• Database can be represented using the notations.
• The relative simplicity and pictorial clarity of diagramming technique
in large part of E-R model.
• In ER diagram, many notations are used to express the cardinality.

5. E-R diagram corresponding to
customer & loan