Explain a data dictionary, Database Management System

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What is a data dictionary?

Data Dictionary is a main source of data in a data management system. Its major function is to carry the creation and management of data definitions. It has details about

What data is contained?
What are the attributes of the data?
What is the relationship existing among the various data elements?

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Attributes, Attributes and its types explain?

Attributes and its types explain?

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