Merge Or aggregate records

[templa73]

Hi
I'm beginner with datamanager and please could some one explain to me the difference between:
-Aggregate records with duplicate key and
-Merge records with duplicate key.

And when can we use one aggregate instead of Merge?

Thanks for all

[MFGF]

Aggregation is the process of rolling measures up the levels of a dimensional hierarchy.  Merging is the process of consolidating duplicate rows on input, based on the rows having the same combination of dimensional keys.

Regards,

MF.