In a database management system, a Many-to-One relationship is defined as a relationship between several instances of one entity and one instance of another entity. For example, it is possible for more than one student to work on a project. A group of five college students is given a project that they must accomplish in a month’s time. It shows a Many-to-One relationship.
In this article, we will dive deeper into Many-to-One Relationship in DBMS according to the GATE Syllabus for (Computer Science Engineering) CSE. Keep reading ahead to learn more.
What is a Many-to-One Relationship in DBMS?
When one or more entries in one table may be linked to each record in the other table, this is known as a Many-to-One relationship. This is also one of the most common types of relationship found along with one-to-many relationships. Depending on how we look at it, a Many-to-One relationship can also be described as a one-to-many relationship.
Example
It is possible for more than one student to work on a project. A group of five college students is given a project that they must accomplish in a month’s time. It describes the connection between the two entities, Student and Project. As a result, the relationship is Many-to-One. However, if we look at it from the other perspective, where a project is linked to multiple students, we can call it a one-to-many relationship.
A reverse of this (one-to-many relationship) would look like this:
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