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A model is an abstraction process
that hides superfluous details. Data modeling is used for representing entities
of interest and their relationship in the database.
Data model and different types of
Data Model
Data model is a collection of
concepts that can be used to describe the structure of a database which
provides the necessary means to achieve the abstraction. The structure of a
database means that holds the data.
=>relationships
=>constraints
Types of Data
Models
1. High Level- Conceptual data
model.
2. Low Level – Physical data
model.
3. Relational or Representational
4. Object-oriented Data Models:
5. Object-Relational Models:
1. High Level-conceptual data
model: User level data model is the high level or conceptual model. This
provides concepts that are close to the way that many users perceive data.
2 .Low level-Physical data model
: provides concepts that describe the details of how data is stored in the
computer model. Low level data model is only for Computer specialists not for
end-user.
3. Representation data model: It
is between High level & Low level data model Which provides concepts that
may be understood by end-user but that are not too far removed from the way
data is organized by within the computer.
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