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

Exercise No. 32: Haircut (dfm)

This simplified E/R schema shows an information system of a hair dressing salon.

A customer will get a haircut by a stylist who works for a branch office and who has a certain experience (junior stylist, master stylist, etc.). The salary, the price of a haircut etc depends on the experience and therefore experience is added as an entity. The stylist may be assisted by an apprentice.
The time dimension consists of day, week and month.

Figure D.E.69.1 - haircut

Please identify the fact of interest and build the attribute tree.
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