我不断收到此 mysql 错误代码 #1089

2021-11-20 00:00:00 mysql

CREATE TABLE `movies`.`movie`
( `movie_id` INT(3) NULL AUTO_INCREMENT, `movie_name` VARCHAR(25) NULL,
  `movie_embedded_id` VARCHAR(50) NULL, `rating_no` INT(3) NULL,
  `movie_description` VARCHAR(50) NULL, PRIMARY KEY (`movie_id`(3))) ENGINE = InnoDB;

我不断收到此错误:

#1089 - 不正确的前缀键；使用的关键部分不是字符串，使用的长度比关键部分长，或者存储引擎没有支持唯一前缀键.

#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.

但我不知道这是什么意思，有人知道吗?

but I've got no idea what it means, anyone have a clue?

推荐答案

同部分

PRIMARY KEY (`movie_id`(3))

您告诉 mysql 在电影 ID 的前 3 个字节上创建一个子部分键*.这仅适用于字符串类型.

you are telling mysql to create a sub part key* on the first 3 Bytes of movie id. This only works for string types.

你需要使用

PRIMARY KEY (`movie_id`)

不提供长度.

*这确定是查询导致错误吗?从来没有在主键上看到过，它用于索引.

*Is this sure the query resulting in the error? Never saw that on a primary key, its used for indexes.

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