Generalization in data base management | Database management

GENERALIZATION It is the form of abstraction that specifies that 2 or more entities that share common attributes can be generalized into a higher level entity time called a super type or a generic entity. The lower levels of entities become the sub type to the super type.It is used to emphasis the...

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Object based data model | Data model

OBJECT BASED DATA MODEL DEFINITION:- It uses the concept such as entities ,attributes and relationship. What is an entity?- An Entity is the distinct object in the organization and that is to be represented in database.There are 2 types of entities.Strong and weak entity.Entity type...

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Relationship and their types | Data models

RELATIONSHIPS AND RELATIONSHIP SETS INTRODUCTION OF RELATIONSHIPS- After two or more entities are identified and defined with attributes, the participants determine if a relationship exists between the entities. A relationship is any association,linkage, or connection between the entities of interest...

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Network model and their Advantages and Disadvantages | Data models

NETWORK MODEL INTRODUCTION- The network model is a database model conceived as a flexible way of representing objects and their relationships. Its distinguishing feature is that the schema, viewed as a graph in which object types are nodes and relationship types are arcs, is not restricted to...

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Network model and its Advantages | data models

NETWORK MODEL INTRODUCTION- The network model is a database model conceived as a flexible way of representing objects and their relationships. Its distinguishing feature is that the schema, viewed as a graph in which object types are nodes and relationship types are arcs, is not restricted to...

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Relational model | Data models

RELATIONAL MODEL INTRODUCTION- Relational model stores the data in the form of table. It consists of three major components. 1.) The set of relations and set of domains that defines the way data can be represented. 2.) Integrity rules that defines the procedure to protect the data. 3.) The operations...

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Hierarchical model (Record based data model) | Data models

HIERARCHICAL MODEL(RECORD BASED DATA MODEL) INTRODUCTION- It is developed to manage large amounts of data for complex manufacturing projects.                              (STRUCTURE OF HIERARCHICAL MODEL) This structure...

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Data models and their types | database managenent system

DATA MODELS INTRODUCTION:- It can be  defined as an integrated collection of concepts for describing and manipulating data,relationship between data and the constrains of the data in any organization. It consists of three components:- 1.)Structured part:- It consist of set of rules according to which database can be connected. 2.) Manipulative part:- It defines the types of operations...

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