Web hosting comparison - Data warehouse database models can have more than
Data warehouse database models can have more than one star schema (more than one fact table). Fact tables are not linked together. If multiple fact tables need to be joined by SQL code queries, multiple fact tables should be constructed as a single fact table (single star schema), as shown in Figure 9-24. Figure 9-24: Multiple star schemas (fact tables) can all be merged into a single fact table. Discovering Business Rules At this stage, the data warehouse model is ready for business rule analysis and application. As previously described in this chapter, business rule application entails the building of tables, establishing the most basic of relationships between those tables, and adding sketchy ideas of table field content. Previously in this chapter, the online auction house OLTP database model already went through the basic business rules application, ERD construction process. All that is needed for the data warehouse model is a simple ERD to begin the process of representing that data warehouse database model in a mathematical fashion. Figure 9-25 shows such an ERD. Seller Category Hierarchy Time Location Buyer Product Listing -Bids -History 248 Chapter 9
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