0
我試圖創建一個外鍵,但它顯示一個錯誤錯誤代碼1215:無法添加外鍵約束
「錯誤代碼1215:無法添加外鍵約束」
和我嘗試修復它,但它不起作用。
這是我的腳本:
drop database if exists `manage_Student`;
create database if not exists `manage_Student` default character set utf8;
use `manage_Student`;
drop table if exists `students`;
create table if not exists `students` (
`id` smallint(8) not null,
`name` varchar(50) not null,
`id_pos` smallint (10) not null,
`address` varchar(50),
`gender` varchar(7) check (gender in ('male', 'female')),
primary key (`id`),
constraint fk_stupos foreign key (`id_pos`) references `position` (`id_pos`)
) engine = InnoDB default char set = utf8;
drop table if exists `position`;
create table if not exists `position` (
`id_pos` smallint (10) not null,
`position` varchar (50),
primary key (`id_pos`)
) engine = InnoDB default char set = utf8;
omg,我很愚蠢。我剛剛學習SQL。感謝你 –
檢查性別是這樣的: alter table'position'添加約束ck_gender檢查('性別'in('M','F','U')); –