Dimensional Modeling tutorial

Step by Step Design of Dimensional Model

1. First identify the business process.

In this step you will determine what is your business process that your data warehouse represents. This process will be the source of your metrics or measurements.

2. Identify the Grain

You will determine what does one row of fact table mean. In the previous example you have decided that your grain is ‘monthly sales per location per product’.

3. Identify the Dimensions

Your dimensions should be descriptive (SQL VARCHAR or CHARACTER) as much as possible and confirm to your grain.

4. Finally Identify the facts

In this step you will identify what are your measurements (or metrics or facts). The facts should be numeric and should confirm to the grain defines in step 2.

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