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Lookup Relationship in Salesforce links two objects together but has no effect on deletion or security. Unlike master-detail fields, lookup fields are not automatically required.
When a salesforce lookup relationship is defined, data from one object can appear as a custom related list on page layouts for the other object. There are derived into 2 subtypes:
A special lookup relationship is available for only the user object. It lets users use a lookup field to associate one user with another that does not directly or indirectly refer to itself.
For example: You can create a custom hierarchical relationship field to store each user’s direct manager.
When an object has a lookup with itself, it is a self-relationship.
Many-to-Many relationships can be modeled using master-details relationships between any two objects. It allows each record of one object to be linked to multiple records from another object and vice versa.To create a many-to-many relationship, simply create a custom junction object with two master-detail relationship fields, each linking to the objects needed to relate.
It is the relation created first with any of the two master objects.
The second master-detail relationship created with another master object.
Note:Junction objects cannot be created as a master object in a master-detail relationship with another object as detail.
Let us now learn Lookup Filter and Schema Builder.
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