我的MySQL有什么问题创建表代码？

Question

为什么我从此代码

中收到此错误

CREATE TABLE `a9311211_AppBook`.`Requests` 
(
   `Name` VARCHAR( 15 ) UNSIGNED CHARACTER SET hp8 COLLATE hp8_bin NOT NULL ,
   `Category` BLOB UNSIGNED NOT NULL ,
   `Dificulty` FLOAT( 2 ) UNSIGNED NOT NULL ,
   `Discription` LONGTEXT UNSIGNED CHARACTER SET hp8 COLLATE hp8_bin NOT NULL 
) ENGINE = MYISAM CHARACTER SET hp8 COLLATE hp8_bin 

  

MySQL说：
   ＃1064 - 您的SQL语法有错误;查看与您的MySQL服务器版本对应的手册，以便在'UNSIGNED CHARACTER SET附近使用正确的语法hp8 COLLATE hp8_bin NOT NULL，Category BLOB UNSIGNED NO'在第1行

Answer 1

删除unsigned

 CREATE TABLE `a9311211_AppBook`.`Requests` (
    `Name` VARCHAR( 15 ) CHARACTER SET hp8 COLLATE hp8_bin NOT NULL ,
    `Catagory` BLOB NOT NULL ,
    `Dificulty` FLOAT( 2 ) UNSIGNED NOT NULL ,
    `Discription` LONGTEXT CHARACTER SET hp8 COLLATE hp8_bin NOT NULL 
) ENGINE = MYISAM CHARACTER SET hp8 COLLATE hp8_bin 

只有数字类型可以是unsigned

Answer 2

它应该是：

`Catagory` BLOB NOT NULL

BLOB不能是正面也不是否定（因为它不是数字）。