sql server database size

gistfile1.txt

SELECT 
	@@SERVERNAME as InstanceName
	, DB_NAME() as DatabaseName
	, ISNULL(s.name+'.'+t.NAME, '**TOTAL**')  AS TableName
	, SUM(p.rows) AS RowCounts
	--, SUM(a.total_pages) * 8 AS TotalSpaceKB
	, SUM(a.total_pages) * 8/1024.0 AS TotalSpaceMB
	, SUM(a.total_pages) * 8/1024.0/1024.0 AS TotalSpaceGB
	, SUM(a.used_pages) * 8/1024.0 AS UsedSpaceMB
	, (SUM(a.total_pages) - SUM(a.used_pages)) * 8/1024.0 AS UnusedSpaceMB
FROM sys.tables t
INNER JOIN sys.schemas s 
ON s.schema_id = t.schema_id
INNER JOIN sys.indexes i 
ON t.OBJECT_ID = i.object_id
INNER JOIN sys.partitions p 
ON i.object_id = p.OBJECT_ID AND i.index_id = p.index_id
INNER JOIN sys.allocation_units a 
ON p.partition_id = a.container_id
WHERE t.NAME NOT LIKE 'dt%'    -- filter out system tables for diagramming
AND t.is_ms_shipped = 0
AND i.OBJECT_ID > 255 
GROUP BY s.name+'.'+t.Name
WITH ROLLUP
ORDER BY TotalSpaceMB DESC