External relationships
We're not covering external data sources and external objects in this book, but it is useful to know the concept of external and indirect lookups.
External data sources are a way to define a connection between Salesforce and a legacy system where business data is stored, but it has been decided not to migrate that data inside Salesforce. The reasons behind this choice are that external data may only be historical data that service agents only need to read when necessary (thereby not counting vis-ˆ-vis overall storage limits) or frequently changing data that does not interfere with CRM data, but that is necessary to access when dealing with your customers.
External data sources rely on a technical connection between ...
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