desc formatted table_name;
desc table_name;
查看关联文件：
desc extended f_tblog_online_mds;
2、查看分区
show partitions table_name;
3、根据分区查询，提高速度
select table_coulm from table_name where partition_name = '2014-02-25';
4、删除分区
alter table table_name drop partition(dt='2014-03-01');
5、删除表
drop tablename;