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

Exercise No. 33: Bus Tour (dfm)

The following E/R schema describes a bus tour.

A customer books a tour to a certain country. On this tour a bus - which is of a certain type - is used and an employee works on it. The time dimension consists of week, month and year.

Figure D.E.5.1 - Bus tour

Please identify the fact of interest and build the attribute tree. No attributes have to be pruned or grafted, but some of them 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.

Please include an additional fact attribute counting the number of tours.

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