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Data Modeling using E-R model

INTRODUCTION Data Model is an abstraction process that hides unnecessary detail from the users for example if you purchase a car then dealer of the car specifies only car information such as mileage not specify other detail such as how its engine works. Data modeling is used in entities and their relationship in the database. The model is used to represent a set of constraint and maintain the data integrity. There are various models to represent the database. Data Model can be classified as: File based Data model Traditional Data Model Semantic Data Model File Based Data Model These models use records to store the entities in a file and directories of various kinds to represent relationship between objects. There are no accepted standard for these models. Traditional Data Models Relational model Hierarchical model Network model Relational Model The relational...