Get File Sizes of Document from Sharepoint Database

This is a simple query to get file sizes from a sharepoint database.  I know there are multiple ways of doing this, but I found this the easiest and also the fastest.

select [filename],

sum(CAST((CAST(CAST(filesize as decimal(38,2))/1024 As 

      decimal(38,2))/1024) AS Decimal(38,2))) AS 'Size in MB'

from (

    select dirname + '/' + leafname as [filename],

           size as filesize,

           siteid,

           webid,

             ExtensionForFile

    from alldocs

    union

    select d.dirname + '/' + d.leafname as [filename],

           v.size as filesize,

           d.siteid,

           d.webid,

             ExtensionForFile

    from alldocs d

    inner join alldocversions v on d.siteid = v.siteid

    and d.id = v.id

) as results

inner join webs s on s.siteid = results.siteid

and s.id = results.webid

where (filesize is not null

  and filesize > 0)

    and ExtensionForFile not like '%aspx%' -- Not Include Certian File Types

group by 

[Filename]

order by 2 desc