Understanding Bubble.io Database Structure     Bubble.io, a popular no-code platform, allows users to create web applications without writing code. A crucial component of any web application is the database structure, and understanding how to set up foreign keys in Bubble.io will help you manage your database relationships efficiently.   Step-by-Step Guide to Setting Up Foreign Keys in Bubble.io     Create Data Types     First, you'll need to create the data types (similar to tables in traditional databases) between which you want to establish a relationship.     Add a Data Type     - Go to the Data tab. - Click on the "Data types" tab. - Click on the "New Type" button. - Name your new data type (e.g., "User", "Order", etc.).     Add Fields to Data Types     Each data type needs fields (similar to columns in traditional databases) to store data.     Add a Field     - Click on your data type (e.g., "User"). - Click on the "Create a new field" button. - Name your field (e.g., "Name", "Email", etc.) - Choose the appropriate field type (e.g., "text", "number", etc.).     Creating a Foreign Key Relationship     To set up a foreign key-like relationship, you'll create a field in one data type that links to another data type.     Add a Foreign Key Field     - Click on the data type where you want to create the foreign key (e.g., "Order"). - Click on "Create a new field". - Give the field a name indicating its link to another data type (e.g., "User"). - For "Field type", select the data type you want to link (e.g., choose "User").     Add a List of Foreign Keys     If you need to link multiple instances of one type to another (e.g., a user can have multiple orders), you will create a list of the foreign key field.     Create a List Field     - Click on the data type where you want to create the list (e.g., "User"). - Click on "Create a new field". - Name the field (e.g., "Orders"). - For "Field type", select the data type (e.g., "Order"). - Check "This field is a list (multiple entries)" to make it a list.     Referencing Data in Workflows and Design     Now that you have your foreign keys set up, you can reference these relationships in your workflows and design.     Using Foreign Key Data in Design     - Go to the Design tab. - Drag an element (e.g., Text) to the canvas. - In the element's properties, select "Insert dynamic data". - Navigate through the linked relationships to select and display related data.     Using Foreign Key Data in Workflows     - Go to the Workflows tab. - Create a new workflow action. - Use the "Do a search for" option to reference data types and their relationships.   By following these steps, you can efficiently manage and utilize foreign key relationships in Bubble.io, ensuring a well-structured and connected database for your application.