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

Exercise No. 42: Betting (dfm)

This simplified E/R schema shows an information system of a betting office.

A customer places a bet on a certain event using various modes of communication (internet, phone, etc.) with a company that has a number of branches in different cities.
The time dimension consists of day, month and year.

Figure D.E.52.1 - betting

Please identify the fact of interest and build the attribute tree. The attribute type of customer has to be pruned as this information is not needed in the data warehouse. Attributes that cannot be used for aggregation in a meaningful way 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