Data Modeling

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Data modeling is the process of creating a blueprint for how data will be stored and used. It involves defining data types, relationships among them, and how data can be grouped and organized.

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A data model helps design the database at the conceptual, physical, and logical levels. It helps represent all required data objects correctly, and omission of data can lead to faulty reports and inco…

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The main parts are entities, attributes, and relationships. Entities are real-world objects or concepts, attributes are their properties, and relationships show how entities are connected.

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An entity is a real-world object or concept about which data is stored. It can be a name, place, object, or class. In an ER diagram, an entity is represented by a rectangle.

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An attribute is a property or characteristic of an entity. Examples include Age, Roll Number, or Marks for a Student. In an ER diagram, an attribute is represented by an ellipse.

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A relationship defines how entities are connected to each other. For example, a customer places an order. In an ER diagram, relationships are shown by diamonds or rhombuses.

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A rectangle represents an entity in an ER diagram.

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An ellipse represents an attribute in an ER diagram.