SQL - Size queries

 SELECT d.NAME
    ,ROUND(SUM(CAST(mf.size AS bigint)) * 8 / 1024, 0) Size_MBs
    ,(SUM(CAST(mf.size AS bigint)) * 8 / 1024) / 1024 AS Size_GBs
FROM sys.master_files mf
INNER JOIN sys.databases d ON d.database_id = mf.database_id
WHERE d.database_id > 4 -- Skip system databases
GROUP BY d.NAME
ORDER BY d.NAME

SELECT 
    t.name AS TableName,
    s.name AS SchemaName,
    p.rows,
    SUM(a.total_pages) * 8 AS TotalSpaceKB, 
    CAST(ROUND(((SUM(a.total_pages) * 8) / 1024.00), 2) AS NUMERIC(36, 2)) AS TotalSpaceMB,
    SUM(a.used_pages) * 8 AS UsedSpaceKB, 
    CAST(ROUND(((SUM(a.used_pages) * 8) / 1024.00), 2) AS NUMERIC(36, 2)) AS UsedSpaceMB, 
    (SUM(a.total_pages) - SUM(a.used_pages)) * 8 AS UnusedSpaceKB,
    CAST(ROUND(((SUM(a.total_pages) - SUM(a.used_pages)) * 8) / 1024.00, 2) AS NUMERIC(36, 2)) AS UnusedSpaceMB
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
ORDER BY 
    TotalSpaceMB DESC, t.name

SELECT 
    OBJECT_SCHEMA_NAME(i.object_id) AS SchemaName,
    OBJECT_NAME(i.object_id) AS TableName,
    i.name AS IndexName,
    i.type_desc AS IndexType,
    ps.index_id,
    SUM(ps.used_page_count) * 8 AS IndexSizeKB,
	SUM(ps.used_page_count) * 8 /1024 AS IndexSizeMB
FROM 
    sys.dm_db_partition_stats ps
INNER JOIN 
    sys.indexes i 
    ON ps.object_id = i.object_id AND ps.index_id = i.index_id
GROUP BY 
    i.object_id, i.index_id, i.name, i.type_desc, ps.index_id
ORDER BY 
    SUM(ps.used_page_count) * 8 DESC;