问题描述

关于 create table 命令中的重复键，我收到了 1022 错误.查看了查询后，我无法理解重复发生的位置.其他人能看到吗?

I'm getting a 1022 error regarding duplicate keys on create table command. Having looked at the query, I can't understand where the duplication is taking place. Can anyone else see it?

SQL query:

-- -----------------------------------------------------
-- Table `apptwo`.`usercircle`
-- -----------------------------------------------------
CREATE TABLE IF NOT EXISTS  `apptwo`.`usercircle` (

 `idUserCircle` MEDIUMINT NOT NULL ,
 `userId` MEDIUMINT NULL ,
 `circleId` MEDIUMINT NULL ,
 `authUser` BINARY NULL ,
 `authOwner` BINARY NULL ,
 `startDate` DATETIME NULL ,
 `endDate` DATETIME NULL ,
PRIMARY KEY (  `idUserCircle` ) ,
INDEX  `iduser_idx` (  `userId` ASC ) ,
INDEX  `idcategory_idx` (  `circleId` ASC ) ,
CONSTRAINT  `iduser` FOREIGN KEY (  `userId` ) REFERENCES  `apptwo`.`user` (
`idUser`
) ON DELETE NO ACTION ON UPDATE NO ACTION ,
CONSTRAINT  `idcategory` FOREIGN KEY (  `circleId` ) REFERENCES  `apptwo`.`circle` (
`idCircle`
) ON DELETE NO ACTION ON UPDATE NO ACTION
) ENGINE = INNODB;

MySQL said: Documentation

#1022 - Can't write; duplicate key in table 'usercircle' 

推荐答案

很可能您的数据库中已经有一个名为 iduser 或 idcategory 的约束.如果是这样，只需重命名约束即可.

The most likely you already have a constraint with the name iduser or idcategory in your database. Just rename the constraints if so.

约束对于整个数据库必须是唯一的，而不仅仅是对于您正在创建/更改的特定表.

Constraints must be unique for the entire database, not just for the specific table you are creating/altering.

要找出当前使用约束的位置，您可以使用以下查询:

To find out where the constraints are currently in use you can use the following query:

SELECT `TABLE_SCHEMA`, `TABLE_NAME`
FROM `information_schema`.`KEY_COLUMN_USAGE`
WHERE `CONSTRAINT_NAME` IN ('iduser', 'idcategory');

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