Fact table type

sarah_id1 at 12h10
18
Nov
2010
Fact table type

Basic questions about fact table type in kimball methodologies. Would appreciate if someone could explain

1)Transactional fact table type
This is the transaction event captured from source OLTP system. Fact table in this case has all the keys instead of actual value.
I dont understand the advantage of fact table when the source OLTP table (e.g. sales table) anyways stores all the transaction records as does fact except that fact has in form
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18/11/2010 at 12h10 by "sarah_id1"