Calculate disk space occupied by each schema in SQL Server

SELECT SCHEMA_NAME(so.schema_id) AS SchemaName
,SUM(ps.reserved_page_count) * 8.0 / 1024 AS SizeInMBFROM sys.dm_db_partition_stats psJOIN sys.indexes i ON i.object_id = ps.object_id
AND i.index_id = ps.index_idJOIN sys.objects so ON i.object_id = so.object_id
WHERE so.type = 'U'
GROUP BY so.schema_id
ORDER BY OBJECT_SCHEMA_NAME(so.schema_id)
,SizeInMB DESC