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Bytes to TeraBytes.

Converting from bytes to terabytes is very easy considering that
terabyte = 1024*Gigabyte
             = 1024 * 1024 * Megabyte
             = 1024 * 1024 * 1024 KiloByte
             = 1024 * 1024 * 1024 * 1024 * Byte

Query below gives number of documents in a media and the total size of the documents. See how you have used Alias in the query




SELECT 
      [MEDIA] = X.media_id,  
      [TOTAL] = COUNT(*),
      [Size_KB] = SUM (Size_MB)
FROM
      (
      SELECT 
            d.edoc_id, 
            d.media_id ,
            SIZE_MB =  (
                        CAST(ISNULL(d.Size1,0) AS DECIMAL) +
                        CAST(ISNULL(d.Size2,0)  AS DECIMAL)
                        ) /  1024 /1024       -- don't use 1024 * 2
      FROM  T.dbo.doc d    
      UNION
      SELECT
             id.edoc_id, 
             id.media_id , 
             SIZE_MB=    CAST(ISNULL(id.Size,0) AS DECIMAL ) /  1024 / 1024
        FROM T.dbo.importdoc id
       ) AS X
group by media_id
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