explain each one in one to two paragraphs with MLA sources

Data Dictionary

Primary Key
Definition

Primary Key
Migration

Redundant
Relationships

Non-key Attributes

Data Type

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Data dictionary, also referred to as metadata repository, can be described as a source of information which may comprise of meaning, the origin, format, the correct usage of data and also the relationship that the data has with other data. A data dictionary can also be described as a document that contains the description of a database or several databases or a component of database management systems which is necessary for determining the structure of the DBMS. A data dictionary can be a type of middleware (an additional layer of data dictionary) that plays a …

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