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Data Warehouse—Time Variant
- The time horizon for the data warehouse is significantly longer than that of operational systems
- Operational database: current value data
- Data warehouse data: provide information from a historical perspective (e.g., past 5-10 years)
- Every key structure in the data warehouse
- Contains an element of time, explicitly or implicitly
- But the key of operational data may or may not contain “time element”
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