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| Fig: Database |
Data :
Data defined as a known fact that can be recorded and that have implicit meaning. Data are raw or isolated facts from which the required information is produced.
Information :
Information are closely related and are often used interchangeably. Information is processed, Information is processed, organized or summarized data.
Schema :
Schema is define as a design of a database. It is a plan of the database. Schema gives the names of the entities and attributes. In other words Schema is overall description of the database.
Sub-schema :
A sub schema is a subset of the schema and inherits the same property that a schema. The plan for a view is often called Sub-schema.
Conceptual Schema :
The conceptual schema is related to the internal schema through conceptual/ internal mapping. The conceptual internal mapping defines the correspondence between the conceptual view and the stored database.
External Schema :
Each external schema is related to the conceptual schema by the external mapping. External conceptual mapping defines the correspondence between a particular external view and the conceptual view.
Data Models:
Data Model is a mechanism that provides abstraction for database application. It represents the organization itself. Data modelling is used for representing entries of interest and their relations in the database.
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