With each subsequent run, Prep is able to detect which rows are new, and thus to only append (i.e. All existing data is copied and put in place. With the initial transfer, data gets transferred from the source to the target table, with write-back.
The following scenario is thus effectively covered: The combination of incremental refresh with the ability to write back to a database is effectively a very powerful combo, that enables a versatile approach allowing you to pick the most optimal approach for identifying new data and inserting that into your destination table.
#Tableau prep sql query code#
If you think about it, that last example can be built without a single line of code and with just two Prep steps! Incremental Updates: A Decent StartĮven before that, Tableau Prep did already support incremental refreshes of its Flows’ data. Aside from that, it can also be used for simpler, no-code data transfers between e.g. machine learning or other data science applications.
That approach covers specific use cases such as cleaning data with Prep, then writing it back to the database so it can be picked up by a specialized process for e.g. Write-back was a heavily anticipated functionality that enables analysts who use Prep to pick up their data, perform Prep’s trademark user-friendly transformations and enrichment and finally write it back to a database table for the next step in the pipeline. For over a year now, we’ve been blessed with one of Tableau Prep’s most powerful new features: the ability to write back to databases.
0 kommentar(er)
