Understanding One-to-Many Relationships: Fundamentals and Establish the Relationship

<p>A foundation in database design is being able to relate tables to each other. One of these relationships involves linking two tables in a one-to-many relationship. In this blog post I will be covering core concepts of a one-to-many relationships, explore the significance, common uses for one-to-many relationships. Also, this blog post will cover how to use these concepts into code using Python and SQLAlchemy.</p> <h1>Fundamentals of a One-to-Many Relationship</h1> <p>A one-to-many relationship is used to describe how one piece of data in a table is related to multiple other pieces of data. In my phase 3 project at Flatiron, I used a one-to-many relationship to link one caster deck to multiple containers, but each container can only relate to one caster deck. There are other situations of one-to-many relationships in the world like:</p> <ul> <li>A single author that has written multiple books.</li> <li>When one person orders and adds multiple items into a cart online.</li> <li>A manager in charge of multiple employees</li> <li>A parent and their children</li> </ul> <h1>Significance and Use Cases</h1> <p>A one-to-many relationships help maintain database integrity and reduces repeated data in the database. This kind of relationship allows an organization of data, avoid redundancy in data, and allow efficient database queries.</p> <p><strong><a href="https://medium.com/@beckerjustin3537/understanding-one-to-many-relationships-fundamentals-and-establish-the-relationship-9538675c4ea">Read More</a></strong></p>