Get all table sizes

SELECT
    s.Name AS SchemaName,
    t.NAME AS TableName,  
    p.rows AS RowCounts,
    SUM(a.total_pages)/ 128.00 AS TotalSpaceMB,
    SUM(a.used_pages) / 128.00 AS UsedSpaceMB,
    (SUM(a.total_pages) - SUM(a.used_pages)) / 128.00 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
    SUM(a.total_pages) desc