mattcasters commented on issue #6876:
URL: https://github.com/apache/hop/issues/6876#issuecomment-4137643250

   The `dbt` option is an option of the snapshot function.  It is equivalent to 
comparing 2 data set snapshots using a `Merge Rows` transform.  Please note 
that the SCD Type 2 built by `dbt` is equivalent to using a `Group By` 
transform across all fields (sorted by ID and timestamp) and then by 
aggregating the timestamp field to get a from/to date range.  It's a quite 
simple process.  The `Dimension Lookup/Update` is not needed for that. 


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