In Slowly Changing Dimensions (SCD), how does Type 4 handle historical data?
- Adds new rows for each change
- Creates separate tables for historical data
- Overwrites existing historical records
- Uses effective dating or versioning
Type 4 SCD handles historical data by using effective dating or versioning. Instead of adding new rows, it maintains the original row with an effective date or version number, allowing for a more compact representation of historical changes without cluttering the table with additional rows.
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