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Business Platforms & EA · Intermediate

Junction Object

Custom object with two master-detail relationships used to model a many-to-many relationship.

Definition

A junction object links two objects so each record can relate to many records of the other. The first master-detail created becomes the primary master, which controls the junction's look and feel and ownership-related behavior.

Example

Job_Application__c is a junction between Candidate__c and Position__c.

Exam tip

The first master-detail field created on the junction is the primary relationship.

Related terms