Logical Data Modeling - One-to-Many cardinality

Data System Architecture

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One-to-many is also known as :

  • to-many
  • Many-to-one
  • Primary Key-Foreign Key Relationships
  • Parent-Child

A many-to-one relationship is where one entity contains values that refer to another entity that has unique values. (ie group)




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How to create a One-to-many / May-to-one Relationship in a Relational Database Model?

This article is the one-to-many relationship in a relational model. For example, in a geography schema having tables Region, State, and City: many states are in a given region, but no states are...
Data System Architecture
Logical Data Modeling - Group (Grouping)

group (or grouping) refers to the fact of putting things (elements) together in a container. This is a one-to-many relationship. In data modeling, you group: attributes in: an entity a relationship...
Data System Architecture
Logical Data Modeling - Hierarchy Relationship

A hierarchy is a composed relationship. It means that it represents a succession of one-to-many relationship that build a tree between: label values or entity A hierarchy is represented in a relational...



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