Figure 2. The relationship diagram of the NorthWind database. a. Use the ERDPlus tool to design a STAR schema of the data warehouse containing one fact table and four dimension tables. Your dimension tables should include one location dimension and one time dimension. Each dimension table must have a key attribute and at least one other attribute. Attach a screenshot of ERDPlus. b. Give an example of an OLAP analysis involving location and time dimensions.

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