For the Customers table managed with slowly changing dimensions, which SCD type should be used to create a new version of the row?

Using Type 2 slowly changing dimensions (SCD) is the appropriate choice for creating a new version of a row in the Customers table. Type 2 SCD allows for the preservation of historical data by creating a new row in the dimension table whenever there is a change to the attributes of a record. This means that the original row remains intact, and a new row is created to reflect the updated information, ensuring that all historical data is preserved and can be queried as needed.

This is particularly useful in scenarios where tracking changes over time is important, such as when customer details change but the history of their previous information must also be retained for reporting and analysis purposes. By utilizing Type 2, organizations can maintain a complete timeline of customer attributes, allowing for richer insights and historical analysis.

In contrast, other types of slowly changing dimensions do not support this kind of historical tracking. Type 0 keeps the original record without any changes, Type 1 simply overwrites the old data without retaining history, and Type 3 retains only a previous version of the value alongside the current value but does not create a new row for historical tracking. Therefore, Type 2 is the most suitable option for maintaining multiple versions of a customer's data over time.