Look Up Relation:
This type of relationship links two
objects together, but has no effect on deletion or security. Unlike
master-detail fields, lookup fields are not automatically required. When
you define a lookup relationship, data from one object can appear as a
custom related list on page layouts for the other object. See
the Salesforce online help for details.
- Child row not automatically deleted when a parent row is deleted
- No inherited sharing.
- 25 lookup relation relationships allowed per object.
- Lookup field on child not necessarily required.
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