By Dejan Sarka
Ace your education for Microsoft Certification examination 70-463 with this 2-in-1 education equipment from Microsoft Press. paintings at your individual speed via a chain of classes and useful routines, after which examine your talents with on-line perform exams - that includes a number of, customizable trying out suggestions.
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Extra resources for Implementing a Data Warehouse with Microsoft SQL Server 2012: Training Kit (Exam 70-463)
You should take care how you aggregate such measures in a report. For time measures, you can calculate average value or use the last value as the aggregate. Quick Check ■■ You are designing an accounting system. Your measures are debit, credit, and balance. What is the additivity of each measure? Quick Check Answer ■■ Debit and credit are additive measures, and balance is a semi-additive measure. Additivity of Measures in SSAS Key Terms Key Terms SSAS is out of the scope of this book; however, you should know some facts about SSAS if your data warehouse is the source for SSAS databases.
Snowflake Schema Figure 1-4 shows a more detailed view of the DimDate dimension from the AdventureWorksDW2012 sample database. The highlighted attributes show that the dimension is denormalized. It is not in third normal form. In third normal form, all non-key columns should nontransitively depend on the key. A different way to say this is that there should be no functional dependency between non-key columns. You should be able to retrieve the value of a non-key column only if you know the key.
Figure 1-1 A diagram of tables you would need for a simple sales report. Even for this relatively simple report, you would end up with 10 tables. You need the sales tables and the tables containing information about customers. The AdventureWorks2012 database schema is highly normalized; it’s intended as an example schema to support LOB applications. Although such a schema works extremely well for LOB applications, it can cause problems when used as the source for reports, as you’ll see in the rest of this section.