方法1
desc tabl_name;
方法2：
查询表中列的注释信息
select * from information_schema.columns
where table_schema = \'db\' #表所在数据库
and table_name = \'tablename\' ; #你要查的表
方法3：
只查询列名和注释
select column_name, column_comment from information_schema.columns where table_schema =\'db\' and table_name = \'tablename\' ;
方法4：
查看表的注释
select table_name,table_comment from information_schema.tables where table_schema = \'db\' and table_name =\'tablename\'
方法5：
查看表生成的DDL
show create table table_name;