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Below we show separate Data Models from a topmost BI Layer down to a Sales Receipt from Malaysia ...
1. Topmost BI Layer with KPIs (Key Performance Indicators)
2. Dimensional Model (Data Mart)
3. Data Warehouse
4. Sales Receipt from Tesco in Malaysia

1) This is the topmost BI Layer ...

2) And this is the Dimensional Model, (Data Mart) ...

3) This is the Data Warehouse ...

4) And this is the Data Model for the Sales Receipt ... NOTE that in Malaysia, Tesco operates Shopping Malls where smaller Stores rent space.

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