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A typical fact table contains keys and measures. For example, in the sample schema (in the preceding diagram), the SalesFact table, contains measures such as units_sold, dollars_sold, and avg_sales, and keys such as time_key, item_key, branch_key, and location_key. The dimension tables are time, branch, item, and location. The main advantages of a star schema are as follows:: They provide a direct and intuitive mapping between the business entities being analyzed by the end users and the schema designThey provide highly optimized performance for typical star queriesThey are widely supported by a large number of business intelligence tools, which may anticipate or even require that the data warehouse schema contains dimension tables Some of the characteristics of the star schema is given in the following section, specifying the features of different tables.

Preparation Analysis of Data Source After installing PowerPivot and getting to know the basic concepts, we will now take a deep dive into data sources and the different types of data sources that can be imported to the PowerPivot interface. As discussed in Chapter 1, Principles and Installing PowerPivot, there are three principles in PowerPivot; the first principle is Preparation, which is displayed in a red colored box in the following figure: Preparation for data analysis The most important thing is that a lot of users may have both structured and unstructured data coming from a variety of sources (for their urgent data analysis).

Likewise, if you have installed the 64-bit version of Excel, you must install the 64-bit version of PowerPivot for Excel. In the Manage box select COM Add-ins and click on the Go... If you have other versions of the PowerPivot add-in installed, those versions will also be listed in the COM Add-ins list. Be sure to select the PowerPivot add-in for Excel 2013. Now PowerPivot will be enabled. Verifying installation After installing the PowerPivot add-in for Excel 2010 or enabling the PowerPivot add-in for Excel 2013, you must verify and test the add-in to check if it has been installed and enabled properly.

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ACTUALTESTS Oracle 1Z0-032 Exam Q and A 05 30 05

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