Share with me an External Lookup field in Salesforce Example?

Use an external lookup relationship when the parent is an external object.

An external lookup relationship links a child standard, custom, or external object to a parent external object.

When you create an external lookup relationship field, the values of the standard External ID field on the parent external object are matched against the values of the external lookup relationship field. For a child external object, the values of the external lookup relationship field come from the specified External Column Name.

Hi,

You can use external object to achieve your requirement. For have that set up, you need to set up the external data source in from one salesforce org to another salesforce org. Provide identity type as “Named Principal” and Authentication Protocol as “Password”. Give your username and password to set up external data source. After that set up external object and provide External Data Source – <select your data source that you have created>. All records of your external salesforce org would be available in second SF org under external object. This is just like the custom object in salesforce to use it.