Our sales representatives call Leads to propose services. Leads are stored in Crm with attributes: LeadId, PrimaryContactNumber, SecondaryContactNumber. All calls are done via Teams and recorded. Calls could be extracted via Microsoft Graph Api and have attributes: CallId, UserId, CalleeNumber, CallerNumber, Duration. Users have these attributes: UserId, Username, Email. How can I generate LINK (relation between User, Lead) using data vault modeling when foreign keys are not known? I thought my design should look like this: User(hub)-Call(link)-Lead(hub), but my call has only userId, leadId could only be inferred from one of the Lead attributes(PrimaryContactNumber or SecondaryContactNumber) What is the best solution to this problem? Or should I model Call as a hub aswell and perform filter when loading data to datamart?
How to create the LINK in data vault without having strong relationship keys (Foreign Keys)?
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A call is not a business entities, it's rather a relation between a sales person and a lead. So, your first thought is right.
To answers your question, you might want take a look at the zero/ghost records concept. http://roelantvos.com/blog/unknown-keys-zero-keys-or-ghost-keys-in-hubs-for-dv2-0/
Basically, add a "Unknown" entry in your Lead(Hub). Then, when you generate the link and the Lead is not known, simply link it to the unknown entities. Make sure you add a satellite to you link, so you can track the period it was unknown, and when it is known.