Question

What is Relationship in RDBMS? Explain the different types of relationship with ER diagram

Answer 1

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There are three types of relationships that can exist between two entities.

• One-to-One Relationship.
• One-to-Many or Many-to-One Relationship.
• Many-to-Many Relationship.

Answer 2

An ER diagram shows the relationship among entity sets. An entity set is a group of similar entities and these entities can have attributes. In terms of DBMS, an entity is a table or attribute of a table in database, so by showing relationship among tables and their attributes, ER diagram shows the complete logical structure of a database. Lets have a look at a simple ER diagram to understand this concept.