mysql> DESCRIBE tableName;
mysql>Desc tableName;  (簡寫代碼)
mysql>show columns from tableName; (等同於DESCRIBE用法)

mysql>help help;
Many help items for your request exist.
To make a more specific request, please type 'help <item>',
where <item> is one of the following
topics:
   HELP COMMAND
   HELP STATEMENT