What is the data source? Typically incremental refreshes handles avoiding dupes and imports with no issue.
The data source is a PostGres database.
The thing is there is always new data coming into the system every day so i'd expect an incremental refresh to add new rows (as per what Tableau seems to suggest online) even though the date (which is what we are using as the field for the incremental) is the same for a record coming into the system at 9am as it is for a record coming in at 5pm.
Just a little concerned as I need to move to incremental because running full refreshes is starting to take longer as the database increases in size.
Any help/advice would be great!
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I think you should also include time stamp for better result.