MySQL table 中的重复键

Question

我在以下 SQL 查询中遇到错误，我不确定如何修复它。错误信息是：

"Error Code: 1022. Can't write; duplicate key in table 't_course_catalog'"

这里是查询：

CREATE TABLE IF NOT EXISTS `TrainingPlan`.`T_Course_Catalog` (
 `CC_ID` INT NOT NULL AUTO_INCREMENT,
 `ID_Catalog_Level` INT NOT NULL,
 `Catalog_Name` VARCHAR(50) NOT NULL,
 `ID_Delivery_Method` INT NOT NULL,
 `Created_Date` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
 `Created_By` VARCHAR(8) NOT NULL,
 `Modified_Date` TIMESTAMP NULL,
 `Modified_By` VARCHAR(8) NULL,
 `Deleted` TINYINT(1) NOT NULL DEFAULT 0,
 PRIMARY KEY (`CC_ID`),
 INDEX `fk_cl_idx` (`ID_Catalog_Level` ASC),
 INDEX `fk_dm_idx` (`ID_Delivery_Method` ASC),
 CONSTRAINT `fk_cl`
   FOREIGN KEY (`ID_Catalog_Level`)
   REFERENCES `TrainingPlan`.`T_Catalog_Level` (`CL_ID`)
   ON DELETE NO ACTION
   ON UPDATE NO ACTION,
 CONSTRAINT `fk_dm`
   FOREIGN KEY (`ID_Delivery_Method`)
   REFERENCES `TrainingPlan`.`T_Delivery_Method` (`DM_ID`)
   ON DELETE NO ACTION
   ON UPDATE NO ACTION)
ENGINE = InnoDB

引用外键应该没有问题，因为引用 table 存在。

Answer 1

尝试重命名您的约束，它们可能在您的数据库中的某处重复。

示例：

fk_cl becomes fk_course_catalog_cl
fk_dm become  fk_course_catalog_dm

或w/e您想要的替代名称。

MySQL table 中的重复键

MySQL duplicate key in table

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