Studierende stehen vor dem LC und blicken lächelnd einer Kollegin mit einer Mappe in der Hand nach.

Exercise No. 24: Paperboy (dfm)

In this simplified E/R schema a customer gets a newspaper by a paperboy. The customer lives in a certain district which belongs to a certain city. The newspaper is published by a certain publishing house which can belong to a media group. The time dimension consists of day, week and month.

Figure D.E.50.1 - paperboy

Please identify the fact of interest and build the attribute tree. Some attributes are not of interest for this data warehouse: We are not interested in the date of birth of a paperboy. Other attributes cannot be used for aggregation in a meaningful way. Those should be tagged as non-dimension attributes in the fact schema.

Then derive the fact schema from the tree by defining dimensions, fact attributes and hierarchies and build a glossary for the fact attributes if there are any.

Solution

This exercise is part of a case study: dfm - apa - log

Exercises List