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

Exercise No. 11: Supply (dfm)

This E/R schema describes a supply process.

An employee who may or may not belong to the procurement department orders a supply from a certain supplier. This supply consists of items which are of a certain type. Each supply has a supply ticket added. The time dimension consists of month, quarter and year.

Figure D.E.6.1 - Supply

Please identify the fact of interest and build the attribute tree. Only the date of the supply is needed, any other information of the ticket can be neglected. Some 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.

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

Solution

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

Exercises List