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ER-Diagram is very important in database. Every time in Punjab University a question of ERD will be asked. Watch this video will full attention. Hope you will got all the point that had explained in this tutorial. Entity is any thing place object event. The characteristics of an entity is called attribute. The association between entities is called relationship. Entity is represented by rectangle in ER-diagram. Attribute is represented by oval shape. Relationship is represented by diamond symbol. Cardinality means how many instance associate with one another. vertical line mean one and crow's foot mean many. Subscribe to Ahmad Computer Academy.