Salesforce Platform Developer I Certification Guide

Relationship types

So, what is a relationship exactly? A relationship is a bi-directional link between two objects. Without relationships, you could create as many standalone custom objects you would like to, but you would not have a way to link them to each other. By creating links between records, you can expose data about other related records on the page layout of a particular record.

While creating relationships between objects, you have to think in advance on how those objects will relate to each other. Therefore, there are three main relationship types:

• One-to-one relationship: This is a direct relation with another object's record and there can only be one at all times. For example, a husband will have only one wife at any given ...