What are slowly changing dimensions (SCDs) in the context of data warehousing?
- Dimensions in a data warehouse that change occasionally
- Dimensions in a data warehouse that change rapidly
- Dimensions in a data warehouse that change slowly
- Dimensions in a data warehouse that do not change
Slowly Changing Dimensions (SCDs) in data warehousing refer to dimensions that change slowly over time, requiring special handling to track historical changes accurately. Common SCD types include Type 1 (overwrite), Type 2 (add new row), and Type 3 (add new column).
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