查询数据库每张表的大小

use database_name;
SELECT 
    t.NAME AS TableName,
    p.rows AS RowCounts,
    SUM(a.total_pages) * 8/1024 AS TotalSpaceMB, 
    SUM(a.used_pages) * 8/1024 AS UsedSpaceMB, 
    (SUM(a.total_pages) - SUM(a.used_pages)) * 8/1024 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
WHERE 
    t.is_ms_shipped = 0 AND i.object_id > 255 -- 排除系统表
GROUP BY 
    t.NAME, p.rows
ORDER BY 
    TotalSpaceMB DESC