Introducing Relationship Custom Fields
As we learned in Chapter 3: Reviewing Database Concepts on page 25, we can define a relationship between two objects through the use of common fields. On the platform, we can define relationships between objects by creating a relationship custom field that associates one object with another. A relationship field is a custom field on an object record that contains a link to another record. When we place a relationship custom field on an object, we’re effectively creating a many-to-one relationship between the object on which the relationship field is placed and the other object.
There are different types of relationship fields, each with different implications. The simplest and most flexible type is a
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