Get size of all tables in a SQL Server database

TableSizes.sql

-- Adapted from: http://stackoverflow.com/a/7892349/19818

SELECT *
FROM (
	SELECT
		name AS TableName,
		'(FILESTREAM)' AS SchemaName,
		0 AS RowCounts,
		size / 8 AS TotalSpaceKB,
		size / 8 as UsedspaceKB,
		0 as UnusedSpaceKB
	FROM
		sys.database_files
	WHERE
		type_desc = 'FILESTREAM'
	UNION ALL
	SELECT 
		t.NAME AS TableName,
		s.Name AS SchemaName,
		p.rows AS RowCounts,
		SUM(a.total_pages) * 8 AS TotalSpaceKB, 
		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%' 
		AND t.is_ms_shipped = 0
		AND i.OBJECT_ID > 255 
	GROUP BY 
		t.Name, s.Name, p.Rows
) AS Sizes
ORDER BY 
    TotalSpaceKB DESC