SCD - Type 5 - Fun Fact

A data warehousing expert, Ralph Kimball, introduced the concept of Slowly Changing Dimensions and defined Types 0, 1, 2, and 3. These widely adopted types became the standard classification for handling dimension changes.

Later, other types, such as Type 4 and Type 6, were proposed by different practitioners to address additional scenarios and use cases that needed to be covered by Kimball's original classification. However, there was no commonly agreed upon and widely adopted SCD Type 5.

In short, SCD Type 5 does not exist because it was never proposed or documented as a distinct method for handling dimension changes. The existing SCD types (0, 1, 2, 3, 4, and 6) cover most use cases and have been widely adopted in the data warehousing community.