One to Many Relationship Cardinality in DBMS

One to Many  Relationship Cardinality in DBMS

 

In this article, we will learn about One to Many Relationship Cardinality in DBMS.

Cardinality tells how many times the entity of an entity set participates in a relationship

There are four different types of cardinalities one to one, many to one, one to many, many to many’ here will discuss how many to one cardinality  is observed

One to Many Relationship Cardinality in DBMS

One-to-Many  cardinality

  • When is a single instance of an entity is associated with more than one instance of another entity then this type of relationship is called one to many relationships
  • Here entities in one entity set can take participation in  any number of times in relationships set and entities in another entity set can take participation only once in a relationship set

Example for one to many cardinalities

 For example in the Real world, many students can study in a single college but the student cannot apply to more than one college at the same time

Read More About other Cardinalities :