What are the commands to view table structure in MySQL?

MySQL 查看表结构简单命令。 
一、简单描述表结构，字段类型desc tabl_name;
显示表结构，字段类型，主键，是否为空等属性，但不显示外键。
二、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
三、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' ;
四、#查看表的注释
select table_name,table_comment from information_schema.tables  where table_schema = 'db' and table_name ='tablename'
ps：二～四是在元数据表中查看，我在实际操作中，常常不灵光，不知为什么，有了解的大侠请留印。
五、查看表生成的DDL  show create table table_name;

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