I'm not sure how this post got here, this section of the forums is for discussion of the forums themselves. And I'm not sure what Tableau does for your question, Tracy Rodgers, can you help with both?
The incremental refresh will look at the data based on the field you've given it to check and add new rows from the database to the extract.
Hope that helps!
then what will happen when i do an update operation over one column field from existing data. Will the record will update in extract or not?