Question: I am a data warehouse developer. We are building an EDW for a health care domain. We could identify most of the dimensions except for Fact, the grain and Measures. We are a bit confused about how to manage the information provider level or patient level. Even provider level requires patient-level information.
Chuck Kelley's Answer: Fact, grain, and measures have little to do with dimensions. Facts are about the measures stored at a particular grain. You may have measures/facts that are stored at the provider and patient level. In fact, I would be concerned if there was not! For example, the fact that a patient was seen by a provider on a certain day caused the exchange of money for a length of time would be an example of that. In this case, the fact would have FK references (logically speaking) to Provider, Patient, and Date dimensions. It would also contain the facts LengthOfVisit, CoPayAmount, InsurancePayAmount.
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