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Conventions

Object-relationship mapping and data modelling

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Object relationship mapping shows how different objects or classes of a program are related to each other.

These maps help us to understand the data that is to be stored or used in a system and allows us to develop ways to convert data between two different storage types.

For example an object orientated approach might store a person as an object with their properties first name and surname. There could be 0 or more of these person objects.

This data could also be stored in a table called people in a SQL database with the data for each person stored in a unique row in that table.

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