select
concat(round(sum(DATA_LENGTH/1024/1024),2),'M')
from information_schema.tables
where table_schema='bfb_db'
AND table_name='t_network_bank_info';
+-------------------------------------------------+
| concat(round(sum(DATA_LENGTH/1024/1024),2),'M') |
+-------------------------------------------------+
| 24.56M |
+-------------------------------------------------+