4
CREATE TABLE IF NOT EXISTS `mydb`.`Info_instrumental` (
`id_instrument` INT NOT NULL COMMENT '',
`instrument` VARCHAR(45) NOT NULL COMMENT '',
`exp_ins` VARCHAR(45) NULL COMMENT '',
`User_name_user` VARCHAR(45) NOT NULL COMMENT '',
PRIMARY KEY (`id_instrument`, `User_name_user` `) COMMENT '',
INDEX `fk_Info_instrumental_User1_idx` (`User_name_user` ` ASC) COMMENT '',
CONSTRAINT `fk_Info_instrumental_User1`
FOREIGN KEY (`User_name_user`)
REFERENCES `mydb`.`Usuario` (`name_user`)
ON DELETE NO ACTION
ON UPDATE NO ACTION)
ENGINE = InnoDB;
我想增加我的ID字段像'001','002','003'....我怎樣才能做到這一點使用觸發器?如何讓MySQL表主鍵自動增量?
我想是這樣的:
| id_instrument | instrument| exp_ins | User_name_user
------------------------------------------------------
| 001 | guitar | 2 years | Marcus
| 002 | piano | 6 months| Leo
'int'值沒有前導零。 – Dai