Oracle
What is Data Actually?
Data:-
It is Stored Representation of OBJECTS and EVENTS That Have Meaning and Importance in the User’s Environment. Data Can be Structure OR Unstructured.
- Structured Student Name, Address..
- Unstructured StudPhoto, AddrMap..
King 10 5500 10-02-06
Blake 10 4500 02-03-05
Clark 20 3500 15-05-04
Smith 30 1800 06-10-00
Miller 20 1100 22-12-03
Taylor 30 3500 24-09-98
What is Information Actually?
Information:
It is Data that is in Processed Form, Such That It Increases the Knowledge of the Person Who Uses the Data.
Representation of Information:
Employees Information
Organization : Date : 13 March 2016.
Techno Solutions Place : kabisuryaNagar.
Name Dept Sal Doj
King 10 5500 10-02-06
Blake 10 4500 02-03-05
Clark 20 3500 15-05-04
Smith 30 1800 06-10-00
Miller 20 1100 22-12-03
Taylor 30 3500 24-09-98
What is Metadata Actually?
Metadata:
It is the Data Which Describes the Properties OR Characteristics of End Users Data and the Context of the Data.
Metadata Properties Can Include Information Such as:
- Data Name.
- Definitions.
- Length OR Size.
- Values Allowed.
- Source of Data.
- Ownership.
Metadata and Data are always separate.
Metadata Enables The Database Designers and Programmers to Understand Exactly in Which Form The Data Should Exist Within The System.
Metadata for Employees Information
Data Item Specification ValueField Name Type Length Min Max
Empname Alpha Numeric 30
DeptNo Integer 2 10 90
EmpSal Decimal 7 1500 50000
HireDate Date
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