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Exercise No. 52: At The Movies (dfm)

In this simplified E/R schema a customer - who belongs to a certain group - watches a movie in a movie-hall. The movie and the movie-hall can be classified according to their type. During this period of time an employee can be present. The time dimension consists of day, week and month.

Figure D.E.49.1 - at the movies

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 an employee. 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.

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

Solution

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

Exercises List