What is a relational database?

Database Management System > DBMS Relational Databases > Introduction

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Answer:

A relational database is a collection of relations (or two-dimensional tables) having distinct names. It is a persistent storage mechanism that conforms to the relational model.

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849. Illustrate the difference between relation schema and relation instance.

# Tutorial: Relational Database Design

Question: DBMS Relational Databases Long

850. Define the term degree.

Answer:

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

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Question: DBMS Relational Databases Short

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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Question: DBMS Relational Databases Short

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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Question: DBMS Relational Databases Short

853. Explain the characteristics of relations?

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Question: DBMS Relational Databases Long

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

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Question: Keys in DDMS Long

855. Illustrate the difference between primary key and foreign key.

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Question: Keys in DDMS Long

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

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857. Can a relation have more than one foreign key? Explain with the help of an example.

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Question: Keys in DDMS Long

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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Question: Keys in DDMS Short