我不断收到此 MySQL 错误 Incorrect prefix key #1089 [重复]

Question

当我尝试创建表时显示此消息。

#1089 - Incorrect prefix key; the used key part isn't a string, the used length is longer than the key part, or the storage engine doesn't support unique prefix keys

这是我的查询：

CREATE TABLE `xyz`.`company_info` ( `c_id` INT(10) NOT NULL AUTO_INCREMENT , `cname` VARCHAR(50) NOT NULL , `ctitle` VARCHAR(100) NOT NULL , `cestab` VARCHAR(20) NOT NULL , `cfounder` VARCHAR(50) NOT NULL , `caddress` VARCHAR(200) NOT NULL , `ccontact` VARCHAR(20) NOT NULL , `cemail` VARCHAR(50) NOT NULL , `cweb` VARCHAR(50) NOT NULL , `clogo` VARCHAR(100) NOT NULL , `status` INT(10) NOT NULL , `created_on` TIMESTAMP NOT NULL , PRIMARY KEY (`c_id`(10))) ENGINE = InnoDB;

Answer 1

替换：

PRIMARY KEY (`c_id`(10))

与：

PRIMARY KEY (`c_id`)

定义字段时已经给出长度，主键定义中无需再次给出。