March 2018
Beginner to intermediate
638 pages
16h 29m
English
Content preview from Mastering Microsoft Power BI
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Fact table columns
Fact tables should only contain columns that are needed for relationships to dimension tables and numeric columns that are referenced by DAX Measures. In some models, an additional column that isn't modeled in a dimension table and is needed for analysis, such as Sales Order Number, may also be included in a fact table.
Given their size and central role in the dataset, fact tables receive much greater analysis to deliver optimal performance and scalability.
In the following T-SQL query of the Reseller Sales source fact table, columns are computed that produce the same values as the ExtendedAmount, SalesAmount, and TotalProductCost columns:
Reseller Sales fact column logic
Only the UnitPrice, OrderQuantity, DiscountAmount ...
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