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The $expand system query option specifies the related resources to be included in line with retrieved resources.
Some examples are :
$expand=primarycontactid$filter=emailaddress1 eq null)
Example : Expand Contact entity, simple primary contact lookup i.e $expand=primarycontactid
Example: Expand Contact entity, simple primary contact lookup with filtering $expand=primarycontactid($filter=emailaddress1 eq null)
Some Other Examples
Example: expand a navigation property of an entity type
Example: expand a navigation property of a Customer type
Example: Expend related Entity with a date equal to null
$expand=Primarycontactid($filter=SomeDate eq null)
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