Logical Data Modeling - One-to-Many cardinality

Data System Architecture

About

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)





Discover More
Jpa Mapping Method
JPA - Entity Annotations

A key feature of EJB 3.0 and JPA is the ability to create entities that contain object-relational mappings by using (metadata) annotations rather than deployment descriptors (orm.xml) as in earlier versions....
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...
Obiee Bridge Schema
OBIEE 10G/11G - How to model a bridge table (Many-to-Many relationship) with the joins property of a Logical Table ?

Dimensional Schemas (Star and snowflake schemas) work well for modeling a particular part of a business where there are one-to-many relationships between the dimension tables and the fact tables. However,...
Data System Architecture
Relational Data Modeling - One-to-many / May-to-one Relationship

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
SQL - Joins (Home)

in SQL. A join is a SQL clause statement which define the set operation such as: intersection, union, that the database must perform between two or more relation (table, view, query, ...). The...



Share this page:
Follow us:
Task Runner