whenever i am executing following query i am getting following result.how to reduce the space

select name, type_desc, size/128 'Size(MB)', FILEPROPERTY(name, 'SpaceUsed') / 128 'SpaceUsed(MB)'

from sys.database_files

name type_desc Size(MB) SpaceUsed(MB)

IEDBNew_DataROWS13733714729

IEDBNew_LogLOG 459 19