Explain the concept of slowly changing dimensions (SCD) in data warehousing. Provide examples of SCD Type 1, Type 2, and Type 3.
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Explain the concept of slowly changing dimensions (SCD) in data warehousing. Provide examples of SCD Type 1, Type 2, and Type 3.
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- Explain the concept of "data warehousing architecture" and its components. What are the key architectural elements that make up a typical data warehousing system?Explain the concept of data virtualization and its role in modern data warehousing architectures.Leveling in DFD and modelling data processes are described.