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26.
What is degree of a Relation?
It is the number of attribute of its relation schema.
27.
What is Relationship type?
Relationship type defines a set of associations or a relationship set among a given set of entity types.
28.
What is Relationship?
It is an association among two or more entities.
29.
What is Relationship set?
The collection (or set) of similar relationships.
30.
What is DDL (Data Definition Language)?
A data base schema is specifies by a set of definitions expressed by a special language called DDL.
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