The following picture is an example of an entity relationship diagram or ERD for short. In the ERD the entities are the invoice, company, customer, and product in the tables listed. Each of these entities are divided attributes which are stored in the columns a database table and records which are stored in the row of the database table. At the top of each row in the database table are the attribute types that are used to help identify the information about the entity. Data types are used to organize and sort data for attributes. Data types usually contain text, numbers, or dates. This diagram is used to show the relationship between the entities.
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