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					Originally Posted by  CCarrot
					 
				 
				I'm not sure if adding a metadata field to a book is available to the average user, though, or if it would require a plugin.  That's outside my expertise, i'm afraid...    
			
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 Custom column = custom book metadata field. Thus, the same performance consideration would apply, unless the plugin calculated the number once and stored it in a numerical column. That way, the calculation would be user initiated only.