Here is the answer of the question:

For the following 9 questions, consider the set of relational database tables below, illustrated using the shorthand we introduced in the module.

For simplicity, assume that a phone number is a permanent attribute of the subscriber and that subscribers on both the “to” and “from” sides of calls are included in the database.

What kind of key best describes the primary key of the PLANS table ?

Refer to the following video for a refresher: video 4.


  • Natural
  • Surrogate
  • Composite


The above question is related to “Introduction to Data Analytics for Business “. If you find the update in question or answers, do comment on this page and let us know. We will update the answers as soon as possible.

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