Wednesday, 18 October 2017

What is Metadata

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Metadata


Metadata can be defined as data about data. It is used to describe the properties and characteristics of some other data. Metadata describe the size, format and other characteristic of data. It also includes the rules and constraints about data.

Example

When you create a table, you specify the data type, size, format and other constraints for entering data in different fields of the table. This is metadata of the table. It describe the properties of data to be stored in the table. Metadata is very important to ensure the integrity of the data.


Field Name
Data type
Length
Description
Constraint
Roll No
Integer
3
Roll No of student
Value from 1 to 100
Name
Alphabetic
50
Name of student

Address
Alphanumeric
100
Address of student

Email
Alphanumeric
25
Email of student
Must contains @ and.
Phone
Alphanumeric
25
Phone of student

Table: Example of metadata

Roll No
Name
Address
Email
Phone
1
Ejaz
Faisalabad
fas@itseries.com.pk
768284
2
Usman
Faisalabad
us@itseries.com.pk
727253
Table: Example of a database table

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