MySQL table creation error
-
11-04-2021 - |
문제
I have two tables named
MEMBER - columns id(primary key), name, email &
TOPICS - columns id, topic_type, created_by.
I want to create a new table MEMBER_TO_TOPICS which maps member to topics, which has columns memberid(foreign key of member table id), topicid(foreign key of topic table id), created_time.
Here is the query am trying to execute .
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;
But getting the following error while executing - MYSQL Error Number 1005 can't Create table member_to_topics (errno:121)
해결책
I tried this on my local machine and it worked fine.
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)
Error code 121 is for Duplicate Key.
[matthewh@kookaburra ~]$ perror 121
OS error code 121: Remote I/O error
MySQL error code 121: Duplicate key on write or update
I suspect you may have a duplicated constraint name perhaps?
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