Exercise 3 1) The manager of an international company would like to know the quantity sold for each product and for each store by day, week, month, and year. For each store, the manager would like to know its corresponding city and country. You have to design a star schema to achieve the goal of this manager. 2) If you think that some of your proposed dimension tables in Q1, are not normalized, you have to convert your star schema into snowflake schema to normalize these dimension tables.

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Enhanced ER Model

The enhanced ER model is an abbreviation for Enhanced Entity-Relationship (EER) model. As you know, the entity-relationship (ER) model is a pictorial illustration of the relationship between various entities of a domain. In the case of a large amount of data with multiple interrelated entities, the ER diagrams become complex and tough to interpret. For such cases, the need for enhancement in the ER model was observed, and thus, the EER model was designed.