Full text search sharepoint 2010: search information from document library

Hi all,

I have a document library with some columns to describe the documents, for example: Title,LongSubject, Description, Departments(Multilookup column)  ,... 

I want to make full text search only for these columns, not in the content of the documents so I create a scope search 

for this document library. Then I create Managed Property for these columns, and then I use full text search query to search

information of document library. 

ex: SELECT Title, LongSubject, Description  FROM scope() WHERE  ( ("SCOPE" = 'Document') ) and ...

And I show the result to the users. 

So I wonder that does this way have the same results when I use CAML to search ?

Thank a lot!