[英]MySQL table creation error
我有两个表名为
成员-列ID(主键),名称,电子邮件和
主题-列ID,topic_type,created_by 。
我想创建它映射成员话题,其中有MEMBERID列(member表ID的外键 )的新表MEMBER_TO_TOPICS,topicid( 主题表ID的外键 ),CREATED_TIME。
这是我要执行的查询。
CREATE TABLE `gsraisin`.`member_to_topics` (
`member_id` VARCHAR(50) NOT NULL,
`topic_id` VARCHAR(50) NOT NULL,
`created_date` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
PRIMARY KEY (`member_id`, `topic_id`),
CONSTRAINT `FK_member_to_topics_memberid` FOREIGN KEY `FK_member_to_topics_memberid`
(`member_id`)
REFERENCES `member` (`id`)
ON DELETE CASCADE
ON UPDATE NO ACTION,
CONSTRAINT `FK_member_to_topics_topicid` FOREIGN KEY `FK_member_to_topics_topicid`
(`topic_id`)
REFERENCES `topics` (`id`)
ON DELETE CASCADE
ON UPDATE NO ACTION
)
ENGINE = InnoDB;
但是在执行时出现以下错误-MYSQL错误号1005无法创建表member_to_topics(errno:121)
我在我的本地计算机上尝试了一下,效果很好。
mysql> show create table member;
+--------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Table | Create Table |
+--------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| member | CREATE TABLE `member` (
`id` varchar(50) NOT NULL DEFAULT '',
`name` varchar(50) DEFAULT NULL,
`email` varchar(50) DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 |
+--------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)
mysql> show create table topics;
+--------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Table | Create Table |
+--------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| topics | CREATE TABLE `topics` (
`id` varchar(50) NOT NULL DEFAULT '',
`topic_type` varchar(50) DEFAULT NULL,
`created_by` varchar(50) DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 |
+--------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)
mysql> show create table member_to_topics;
+------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Table | Create Table |
+------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| member_to_topics | CREATE TABLE `member_to_topics` (
`member_id` varchar(50) NOT NULL,
`topic_id` varchar(50) NOT NULL,
`created_date` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
PRIMARY KEY (`member_id`,`topic_id`),
KEY `FK_member_to_topics_topicid` (`topic_id`),
CONSTRAINT `FK_member_to_topics_memberid` FOREIGN KEY (`member_id`) REFERENCES `member` (`id`) ON DELETE CASCADE ON UPDATE NO ACTION,
CONSTRAINT `FK_member_to_topics_topicid` FOREIGN KEY (`topic_id`) REFERENCES `topics` (`id`) ON DELETE CASCADE ON UPDATE NO ACTION
) ENGINE=InnoDB DEFAULT CHARSET=latin1 |
+------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)
错误代码121用于重复密钥。
[matthewh@kookaburra ~]$ perror 121
OS error code 121: Remote I/O error
MySQL error code 121: Duplicate key on write or update
我怀疑您可能有重复的约束名称?
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