SELECT
t.NAME AS TableName,
s.Name AS SchemaName,
(SUM(a.total_pages) * 8) AS TotalSpaceKB,
(SUM(a.total_pages) * 8) /1024 / 1024 AS
TotalSpaceGB,
SUM(a.used_pages) * 8 AS UsedSpaceKB,
(SUM(a.total_pages) - SUM(a.used_pages)) * 8 AS UnusedSpaceKB
FROM
sys.tables t
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
LEFT OUTER JOIN sys.schemas s ON t.schema_id = s.schema_id
WHERE
t.NAME NOT LIKE 'dt%'
GROUP BY t.Name, s.Name
ORDER BY (SUM(a.total_pages) * 8) desc
