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Data Loader and Updating -- How does it work?

Curious about how the data loader would handle the following scenario while performing an update/upsert:

Lets assume we have a custom object that's full of data and we are going to use the data loader to perform an update/upsert on this data. What if there is a record in our new data file and an identical record in the object we want to update/upsert.

Does the data loader overwrite this record, even though there are no changes to the record, or does it skip this record, because there are no changes to it, and move on to the next record?

Also, would it be safe to say, that if the record is skipped because there is no changes, that no workflows would be fired?



the "changes" are applied regardless, and workflow/apex etc will still fire.