选中对应需要查询的数据库后进行查询
下面查询的是占用最大的前20个表
若需要添加查询条件可在where后自行添加
字段：注释内容为大小KB和大小MB

SELECT top 20
    t.NAME AS '表名',
    p.rows AS '行数',
--     SUM(a.total_pages) * 8 AS TotalSpaceKB,
--     CAST(ROUND((SUM(a.total_pages) * 8.00 / 1024), 2) AS NUMERIC(36, 2)) AS TotalSpaceMB,
    CAST(ROUND((SUM(a.total_pages) * 8.00 / 1024/ 1024), 2) AS NUMERIC(36, 2)) AS '大小G'
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.NAME LIKE 'pos_stockhistory%' AND t.is_ms_shipped = 0 -- AND i.OBJECT_ID > 255
GROUP BY t.NAME, p.Rows
ORDER BY CAST(ROUND((SUM(a.total_pages) * 8.00 / 1024), 2) AS NUMERIC(36, 2)) desc