MySQL 错误 150 : two VARCHAR(255) attributes

Question

我正在为存档创建新表，并且同时设置外键。

我尝试了不同类型的 varchar 大小，检查了 InnoDB 等，并检查了表名称中是否存在拼写错误。

CREATE TABLE `VKST_Project`
(
  `id` int PRIMARY KEY,
  `brand` varchar(255),
  `city` varchar(255),
  `street` varchar(255),
  `plz` varchar(255),
  `center_name` varchar(255),
  `nation` varchar(255),
  `shop_type` varchar(255),
  `state` varchar(255),
  `sales_area` varchar(255),
  `open_date` varchar(255),
  `construction_date` varchar(255),
  `re_open_date` varchar(255),
  `local_manager` varchar(255),
  `window_length` double,
  `object_front_length` double,
  `security_alarm` boolean,
  `security_goods` boolean,
  `fire_sprinklers` boolean,
  `fire_smoke_alarm` boolean,
  `fire_RWA` boolean,
  `advert_modules` varchar(255),
  `tech_equipment` varchar(255),
  `ventilation` varchar(255),
  `heating` varchar(255)
)  ENGINE=InnoDB DEFAULT CHARSET=utf8;;

CREATE TABLE `Floor`
(
  `id` int PRIMARY KEY AUTO_INCREMENT,
  `floor_id` varchar(255),
  `object_id` int,
  `floor_space_total` double,
  `floor_space_sales` double,
  `floor_space_store` double,
  `floor_space_others` double,
  `floor_capacity_total` double,
  `floor_capacity_sales` double,
  `floor_capacity_store` double,
  `floor_capacity_others` double
)  ENGINE=InnoDB DEFAULT CHARSET=utf8;;

CREATE TABLE `Room`
(
  `id` int PRIMARY KEY AUTO_INCREMENT,
  `room_id` varchar(255),
  `floor_id` varchar(255),
  `object_id` int,
  `name` varchar(255),
  `space` double,
  `height` double,
  `sap` varchar(255),
  `cad_file_name` varchar(255),
  `DIN_Type` varchar(255),
  `GIF_Type` varchar(255)
)  ENGINE=InnoDB DEFAULT CHARSET=utf8;;

CREATE TABLE `Ceiling`
(
  `ceiling_id` int PRIMARY KEY AUTO_INCREMENT,
  `room_id` varchar(255),
  `material` varchar(255)
)  ENGINE=InnoDB DEFAULT CHARSET=utf8;;

CREATE TABLE `Flooring`
(
  `flooring_id` int PRIMARY KEY AUTO_INCREMENT,
  `room_id` varchar(255),
  `material` varchar(255)
)  ENGINE=InnoDB DEFAULT CHARSET=utf8;;

ALTER TABLE `Floor` ADD FOREIGN KEY (`object_id`) REFERENCES `VKST_Project` (`id`);

ALTER TABLE `Room` ADD FOREIGN KEY (`floor_id`) REFERENCES `Floor` (`floor_id`);

ALTER TABLE `Room` ADD FOREIGN KEY (`object_id`) REFERENCES `VKST_Project` (`id`);

ALTER TABLE `Ceiling` ADD FOREIGN KEY (`room_id`) REFERENCES `Room` (`room_id`);

ALTER TABLE `Flooring` ADD FOREIGN KEY (`room_id`) REFERENCES `Room` (`room_id`);

错误发生在这里:ALTER TABLE Room ADD FOREIGN KEY (floor_id) REFERENCES Floor (floor_id) ;

错误:150“外键约束格式不正确”

Answer 1

'MySQL 需要外键和引用键上的索引' mysql 将在引用表中生成索引，但您必须在引用表(楼层、房间)中生成它们，作为定义的一部分或使用更改表。 https://dev.mysql.com/doc/refman/5.6/en/create-table-foreign-keys.html

drop table if exists flooring;
drop table if exists ceiling;
drop table if exists room;
drop table if exists floor;
drop table if exists vkst_project;

CREATE TABLE `VKST_Project`
(
  `id` int PRIMARY KEY,
  `brand` varchar(255),
  `city` varchar(255),
  `street` varchar(255),
  `plz` varchar(255),
  `center_name` varchar(255),
  `nation` varchar(255),
  `shop_type` varchar(255),
  `state` varchar(255),
  `sales_area` varchar(255),
  `open_date` varchar(255),
  `construction_date` varchar(255),
  `re_open_date` varchar(255),
  `local_manager` varchar(255),
  `window_length` double,
  `object_front_length` double,
  `security_alarm` boolean,
  `security_goods` boolean,
  `fire_sprinklers` boolean,
  `fire_smoke_alarm` boolean,
  `fire_RWA` boolean,
  `advert_modules` varchar(255),
  `tech_equipment` varchar(255),
  `ventilation` varchar(255),
  `heating` varchar(255)
)  ENGINE=InnoDB DEFAULT CHARSET=utf8;

CREATE TABLE `Floor`
(
  `id` int PRIMARY KEY AUTO_INCREMENT,
  `floor_id` varchar(255),
  `object_id` int,
  `floor_space_total` double,
  `floor_space_sales` double,
  `floor_space_store` double,
  `floor_space_others` double,
  `floor_capacity_total` double,
  `floor_capacity_sales` double,
  `floor_capacity_store` double,
  `floor_capacity_others` double,
  key flk1(floor_id)
)  ENGINE=InnoDB DEFAULT CHARSET=utf8;

CREATE TABLE `Room`
(
  `id` int PRIMARY KEY AUTO_INCREMENT,
  `room_id` varchar(255),
  `floor_id` varchar(255),
  `object_id` int,
  `name` varchar(255),
  `space` double,
  `height` double,
  `sap` varchar(255),
  `cad_file_name` varchar(255),
  `DIN_Type` varchar(255),
  `GIF_Type` varchar(255),
  key rki(room_id),
  key rk2(floor_id)
)  ENGINE=InnoDB DEFAULT CHARSET=utf8;

CREATE TABLE `Ceiling`
(
  `ceiling_id` int PRIMARY KEY AUTO_INCREMENT,
  `room_id` varchar(255),
  `material` varchar(255)
)  ENGINE=InnoDB DEFAULT CHARSET=utf8;

CREATE TABLE `Flooring`
(
  `flooring_id` int PRIMARY KEY AUTO_INCREMENT,
  `room_id` varchar(255),
  `material` varchar(255)
)  ENGINE=InnoDB DEFAULT CHARSET=utf8;

ALTER TABLE `Floor` ADD FOREIGN KEY fk1(`object_id`) REFERENCES `VKST_Project` (`id`);

ALTER TABLE `Room` ADD FOREIGN KEY fk2(`floor_id`) REFERENCES `Floor` (`floor_id`);

ALTER TABLE `Room` ADD FOREIGN KEY fk3(`object_id`) REFERENCES `VKST_Project` (`id`);

ALTER TABLE `Ceiling` ADD FOREIGN KEY fk4(`room_id`) REFERENCES `Room` (`room_id`);

ALTER TABLE `Flooring` ADD FOREIGN KEY fk5(`room_id`) REFERENCES `Room` (`room_id`);