Handling relationships in SQL databases

Database relationships are associations between two or more tables that allow you to model complex data structures and perform queries across multiple tables. In this recipe, you will learn how to implement one-to-one, many-to-one, and many-to-many relationships for the existing ticketing system application. You will also see how to use SQLAlchemy to define your database schema relationships and query the database.

Getting ready

To follow the recipe, you need to have the core of the application already implemented with at least one table in it. If you have already done that, you will also have the necessary packages ready. We will keep on working on our ticketing system platform application.

How to do it…

We will now proceed to set up relationships. We will show an example for each type of SQL table relationship.

One to one

We will demonstrate the one-to-one relationship by making a new table that holds details about...