Define the term degree.

Database Management System > DBMS Relational Databases > Relational Database Design

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490

Answer:

The number of attributes in a relation is known as degree or arity.

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851. What do you mean by the term cardinality?

Answer:

The number of tuples in a relation is known as cardinality.

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852. What are unary, binary, and ternary relations?

Answer:

A relation of degree one is known as unary relation. A relation of degree two is known as binary relation. A relation of degree three is known as ternary relation.

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853. Explain the characteristics of relations?

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854. All candidate keys are superkeys, whereas all superkeys are not candidate keys. Justify this statement with a suitable example.

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856. What do you mean by a self-referencing foreign key? Explain with the help of an example.

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858. Explain integrity constraints. Describe their importance.

Answer:

Integrity constraints are the rules defined on a relational database schema and satisfied by all the instances of database in order to model the real-world concepts correctly. They ensure the consistency of database while the modifications are made by the users. For example, the integrity constraint ensures that the value of ISBN in BOOK relation cannot be duplicated or null.

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