错误 1064 - 创建触发器期间“附近的语法错误”

Question

我收到此错误： 错误代码：1064。您的 SQL 语法有错误；检查与您的 MySQL 服务器版本相对应的手册，以在第 7 行的 '' 附近使用正确的语法

关于以下查询：

DELIMITER //
create trigger UpdateTrigger 
    after update
        on reserva for each row
begin
IF NEW.reserva_valida = 0 THEN
    DELETE FROM companhia_aerea.venda 
    where companhia_aerea.venda = NEW.reserva_id;
END IF;
end;
DELIMITER ;

这就是我创建所涉及的两个表的方式：

储备：

CREATE TABLE IF NOT EXISTS `companhia_aerea`.`reserva` (
  `reserva_id` INT NOT NULL AUTO_INCREMENT,
  `reserva_data_validade` DATE NOT NULL,
  `reserva_valida` TINYINT NOT NULL,
  `reserva_voo_id` INT NOT NULL,
  `reserva_venda_id` INT NOT NULL,
  PRIMARY KEY (`reserva_id`),
  INDEX `fk_reserva_voo1_idx` (`reserva_voo_id` ASC) VISIBLE,
  INDEX `fk_reserva_venda1_idx` (`reserva_venda_id` ASC) VISIBLE,
  CONSTRAINT `fk_reserva_voo1`
    FOREIGN KEY (`reserva_voo_id`)
    REFERENCES `companhia_aerea`.`voo` (`voo_id`)
    ON DELETE NO ACTION
    ON UPDATE NO ACTION,
  CONSTRAINT `fk_reserva_venda1`
    FOREIGN KEY (`reserva_venda_id`)
    REFERENCES `companhia_aerea`.`venda` (`venda_id`)
    ON DELETE NO ACTION
    ON UPDATE NO ACTION)
ENGINE = InnoDB;

文达：

DROP TABLE IF EXISTS companhia_aerea.venda;
CREATE TABLE IF NOT EXISTS `companhia_aerea`.`venda` (
  `venda_id` INT NOT NULL AUTO_INCREMENT,
  `reserva_id` INT NOT NULL,
  `venda_parcelas` INT NOT NULL,
  PRIMARY KEY (`venda_id`))
ENGINE = InnoDB;

Answer 1

您需要引用delete 的where 子句中的列，而不是表。表别名会有所帮助：

DELIMITER //
create trigger UpdateTrigger 
    after update
        on reserva for each row
begin
    IF NEW.reserva_valida = 0 THEN
        DELETE v FROM companhia_aerea.venda v
        WHERE v.reserva_id = NEW.reserva_id;
    END IF;
end;
DELIMITER ;