[英]Create table Error MySQL Varchar Foreign Key
I'm trying to create 2 tables with one foreign key but mysql says: 我试图用一个外键创建2个表,但是mysql表示:
#1215 - Cannot add foreign key constraint.
#1215-无法添加外键约束。 (users_gifts)
(users_gifts)
-- -----------------------------------------------------
-- Table `gifts`
-- -----------------------------------------------------
CREATE TABLE IF NOT EXISTS `gifts` (
`gift_code` VARCHAR(15) NOT NULL,
`gift_redeemcredit` INT NOT NULL DEFAULT 0,
`gift_redeemurl` VARCHAR(200) NULL DEFAULT '#',
`gift_description` VARCHAR(75) NOT NULL,
`gift_expirydate` DATETIME NOT NULL,
PRIMARY KEY (`gift_code`))
ENGINE = InnoDB
DEFAULT CHARACTER SET = utf8;
-- -----------------------------------------------------
-- Table `users_gifts`
-- -----------------------------------------------------
CREATE TABLE IF NOT EXISTS `users_gifts` (
`user_code` INT NOT NULL,
`gift_code` VARCHAR(15) NOT NULL,
`usergift_date` DATETIME NOT NULL,
INDEX `users_gifts_to_gifts_idx` (`gift_code` ASC),
CONSTRAINT `users_gifts_to_gifts`
FOREIGN KEY (`gift_code`)
REFERENCES `gifts` (`gift_code`)
ON DELETE NO ACTION
ON UPDATE NO ACTION)
ENGINE = InnoDB;
you have no error in your code , but propably you have already created this foreign key . 您的代码中没有错误,但很可能您已经创建了此外键。
try that before creating your tables. 在创建表格之前尝试一下。
ALTER TABLE `users_gifts` DROP FOREIGN KEY `users_gifts_to_gifts` ;
我解决了将DEFAULT CHARACTER SET设置到所有表的问题:
DEFAULT CHARACTER SET = utf8;
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