为什么我收到错误：错误 1822：无法添加外键约束？引用表中缺少约束 XXXX 的索引？

编程问答 2022-05-17

问题描述

为什么我在创建表时总是收到以下错误？

错误：错误 1822：无法添加外键约束。失踪 约束索引 'fk_PAYMENT_METHOD_MATRIX_PAYMENT_METHOD_TENT_STRFRNT1'在 引用表“PAYMENT_METHOD_TNANT_STRFRNT”

我将 PAYMENT_METHOD_TNANT_STRFRNT 表的主键集定义为 PAYMENT_METHOD_MATRIX 表中的外键。

如果我在 PAYMENT_METHOD_MATRIX 中删除 STOREFRONTand TENANT` 作为 FOREIGN KEY 那么它就可以工作了。

我错过了什么？

-- -----------------------------------------------------
-- Table `mydb`.`PAYMENT_METHOD`
-- -----------------------------------------------------
CREATE TABLE IF NOT EXISTS `mydb`.`PAYMENT_METHOD` (
  `PAYMENT_METHODID` VARCHAR(64) NOT NULL,`STATUS` VARCHAR(64) NOT NULL,PRIMARY KEY (`PAYMENT_METHODID`))
ENGINE = InnoDB
ROW_FORMAT = Default;


-- -----------------------------------------------------
-- Table `mydb`.`PAYMENT_METHOD_TNANT`
-- -----------------------------------------------------
CREATE TABLE IF NOT EXISTS `mydb`.`PAYMENT_METHOD_TNANT` (
  `PAYMENT_METHOD_ID` VARCHAR(64) NOT NULL,`TENANT` VARCHAR(64) NOT NULL,`CREATED_DATE` TIMESTAMP NOT NULL,`MODIFY_DATE` TIMESTAMP NOT NULL,INDEX `fk_PAYMENT_METHOD_TENANT_PAYMENT_METHOD1_idx` (`PAYMENT_METHOD_ID` ASC) VISIBLE,PRIMARY KEY (`PAYMENT_METHOD_ID`,`TENANT`),CONSTRAINT `fk_PAYMENT_METHOD_TENANT_PAYMENT_METHOD1`
    FOREIGN KEY (`PAYMENT_METHOD_ID`)
    REFERENCES `mydb`.`PAYMENT_METHOD` (`PAYMENT_METHODID`)
    ON DELETE NO ACTION
    ON UPDATE NO ACTION)
ENGINE = InnoDB;


-- -----------------------------------------------------
-- Table `mydb`.`PAYMENT_METHOD_TNANT_STRFRNT`
-- -----------------------------------------------------
CREATE TABLE IF NOT EXISTS `mydb`.`PAYMENT_METHOD_TNANT_STRFRNT` (
  `PAYMENT_METHOD_ID` VARCHAR(64) NOT NULL,`STOREFRONT` VARCHAR(64) NOT NULL,`TENANT`,`STOREFRONT`),INDEX `fk_PAYMENT_METHOD_TENT_STRFRNT_PAYMENT_METHOD_TENANT1_idx` (`PAYMENT_METHOD_ID` ASC,`TENANT` ASC) VISIBLE,CONSTRAINT `fk_PAYMENT_METHOD_TENT_STRFRNT_PAYMENT_METHOD_TENANT1`
    FOREIGN KEY (`PAYMENT_METHOD_ID`,`TENANT`)
    REFERENCES `mydb`.`PAYMENT_METHOD_TNANT` (`PAYMENT_METHOD_ID`,`TENANT`)
    ON DELETE NO ACTION
    ON UPDATE NO ACTION)
ENGINE = InnoDB;


-- -----------------------------------------------------
-- Table `mydb`.`PAYMENT_METHOD_MATRIX`
-- -----------------------------------------------------
CREATE TABLE IF NOT EXISTS `mydb`.`PAYMENT_METHOD_MATRIX` (
  `PAYMENT_METHOD_MATRIX_ID` INT NOT NULL,`PAYMENT_METHOD_ID` VARCHAR(64) NOT NULL,`TENANT` VARCHAR(45) NOT NULL,`COUNTRY` VARCHAR(45) NOT NULL,`disP_ORDER` SMALLINT NOT NULL,PRIMARY KEY (`PAYMENT_METHOD_MATRIX_ID`,`PAYMENT_METHOD_ID`,`STOREFRONT`,`COUNTRY`),INDEX `fk_PAYMENT_METHOD_MATRIX_PAYMENT_METHOD_TENT_STRFRNT1_idx` (`STOREFRONT` ASC,`PAYMENT_METHOD_ID` ASC,CONSTRAINT `fk_PAYMENT_METHOD_MATRIX_PAYMENT_METHOD_TENT_STRFRNT1`
    FOREIGN KEY (`STOREFRONT`,`TENANT`)
    REFERENCES `mydb`.`PAYMENT_METHOD_TNANT_STRFRNT` (`STOREFRONT`,`TENANT`)
    ON DELETE NO ACTION
    ON UPDATE NO ACTION)
ENGINE = InnoDB;

解决方法

您需要在索引 STOREFRONT 中添加 fk_PAYMENT_METHOD_MATRIX_PAYMENT_METHOD_TENT_STRFRNT1_idx ASC PAYMENT_METHOD_MATRIX 表。这解决了这个问题。但是，尽管它正在工作，但我建议您对 TENANT 列使用相同长度的 Varchar 以避免这两个表中出现任何进一步的问题。

Working Code:

CREATE TABLE IF NOT EXISTS PAYMENT_METHOD (
  `PAYMENT_METHODID` VARCHAR(64) NOT NULL,`STATUS` VARCHAR(64) NOT NULL,PRIMARY KEY (`PAYMENT_METHODID`))
ENGINE = InnoDB
ROW_FORMAT = Default;


-- -----------------------------------------------------
-- Table `PAYMENT_METHOD_TNANT`
-- -----------------------------------------------------
CREATE TABLE IF NOT EXISTS `PAYMENT_METHOD_TNANT` (
  `PAYMENT_METHOD_ID` VARCHAR(64) NOT NULL,`TENANT` VARCHAR(64) NOT NULL,`CREATED_DATE` TIMESTAMP NOT NULL,`MODIFY_DATE` TIMESTAMP NOT NULL,INDEX `fk_PAYMENT_METHOD_TENANT_PAYMENT_METHOD1_idx` (`PAYMENT_METHOD_ID` ASC) VISIBLE,PRIMARY KEY (`PAYMENT_METHOD_ID`,`TENANT`),CONSTRAINT `fk_PAYMENT_METHOD_TENANT_PAYMENT_METHOD1`
    FOREIGN KEY (`PAYMENT_METHOD_ID`)
    REFERENCES `PAYMENT_METHOD` (`PAYMENT_METHODID`)
    ON DELETE NO ACTION
    ON UPDATE NO ACTION)
ENGINE = InnoDB;

✓

✓

-- -----------------------------------------------------
-- Table `PAYMENT_METHOD_TNANT_STRFRNT`
-- -----------------------------------------------------
CREATE TABLE IF NOT EXISTS `PAYMENT_METHOD_TNANT_STRFRNT` (
  `PAYMENT_METHOD_ID` VARCHAR(64) NOT NULL,`STOREFRONT` VARCHAR(64) NOT NULL,`TENANT`,`STOREFRONT`),INDEX `fk_PAYMENT_METHOD_TENT_STRFRNT_PAYMENT_METHOD_TENANT1_idx` (`STOREFRONT` ASC,`PAYMENT_METHOD_ID`  ASC,`TENANT` ASC) VISIBLE,CONSTRAINT `fk_PAYMENT_METHOD_TENT_STRFRNT_PAYMENT_METHOD_TENANT1`
    FOREIGN KEY (`PAYMENT_METHOD_ID`,`TENANT`)
    REFERENCES `PAYMENT_METHOD_TNANT` (`PAYMENT_METHOD_ID`,`TENANT`)
    ON DELETE NO ACTION
    ON UPDATE NO ACTION)
ENGINE = InnoDB;

✓

-- -----------------------------------------------------
-- Table `PAYMENT_METHOD_MATRIX`
-- -----------------------------------------------------
CREATE TABLE IF NOT EXISTS `PAYMENT_METHOD_MATRIX` (
  `PAYMENT_METHOD_MATRIX_ID` INT NOT NULL,`PAYMENT_METHOD_ID` VARCHAR(64) NOT NULL,`TENANT` VARCHAR(45) NOT NULL,`COUNTRY` VARCHAR(45) NOT NULL,`DISP_ORDER` SMALLINT NOT NULL,PRIMARY KEY (`PAYMENT_METHOD_MATRIX_ID`,`PAYMENT_METHOD_ID`,`STOREFRONT`,`COUNTRY`),INDEX `fk_PAYMENT_METHOD_MATRIX_PAYMENT_METHOD_TENT_STRFRNT1_idx` (`STOREFRONT` ASC,`PAYMENT_METHOD_ID` ASC,CONSTRAINT `fk_PAYMENT_METHOD_MATRIX_PAYMENT_METHOD_TENT_STRFRNT1`
    FOREIGN KEY (`STOREFRONT`,`TENANT`)
    REFERENCES `PAYMENT_METHOD_TNANT_STRFRNT` (`STOREFRONT`,`TENANT`)
    ON DELETE NO ACTION
    ON UPDATE NO ACTION)
ENGINE = InnoDB;

✓

dbfiddle here

foreign-keysmysqlsqlsql