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Lecture-4: Define the entity, entity set and data model.

3.1 Define the entity, entity set and data model.
3.2 Mention the meaning of E‐R diagram symbol.
3.3 Describe the E‐R diagram for different mapping constraints.
3.4 State different types of attribute uses in E‐R diagram.
3.5 State techniques to convert E‐R diagram to table.
3.6 Describe the different types of data models with examples.
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