Determine exactly what one row in the fact table represents (e.g., one line item on a retail receipt).
Add a new column to show the previous value (limited history). Impact on the Industry The Data Warehouse Toolkit: The Definitive Guid...
Choose the descriptive attributes that apply to every row at that grain. Determine exactly what one row in the fact
These store quantitative metrics (measurements) of a business process, such as sale_amount or quantity_sold . They typically contain foreign keys connecting to dimensions. The Data Warehouse Toolkit: The Definitive Guid...
The book revolves around the "Star Schema," consisting of two main table types:
Identify the specific activity to model (e.g., retail sales, hospital admissions).