ALTER TABLE orders ADD CONSTRAINT orders_customers_fk FOREIGN KEY (cust_id) REFERENCES customers (cust_id); # 删除外键 ALTER TABLE orders DROP FOREIGN KEY orders_customers_fk; # 向主表添加数据 INSERT INTO customers (cust_id,cust_name) VALUES (666,'王老五');-- 成功 # 向从表添加数据 INSER...
Create table role(id int primary key auto_increment,name char(6),permission char(3),comment varchar(10));2、建立关联表 Create table user2role(id int primary key auto_increment,user_id int(2),role_id int(2), Foreign key(user_id) references user(id) on update cascade on delete cascade...
在使用GORM的创建foreignKey关系的时,不管是按照官方文档给的例子写,还是说加上`gorm:"foreignKey:ID;references:UserId;"` 这样的,都是一样报错:define a valid foreign key for ... ,网上大部分给
foreign key(repo_id) references repo_table(repo_id)) user 表:id 为主键 profile 表: uid 为主键 简单来说,若表 profile 的 uid 列 作为外键(外建名称:user_profile),参考的主表的列(references)为 user 表的 id,且联动删除更新操作(on delete cascade on update cascade),则 user 表中删除 id 为 ...
REFERENCES `user`(`id`))ENGINE=InnoDBAUTO_INCREMENT=4DEFAULTCHARSET=utf81rowinset(0.00sec)ERROR:Noquery specified mysql>alter table `order` drop foreign key order_ibfk_1;//删除foreign key,mysql里面没有修改foreign key的命令QueryOK,2rows affected(0.10sec)Records:2Duplicates:0Warnings:0//删除后...
SQL定义功能中,用CREATE TABLE建立表时,FOREIGN KEY...REFERENCES…短语的含义是A.说明主关键字B.建立表之间的联系C.说明有效性规则
FOREIGN KEY(属性名)REFERENCES表名(属性名) [ONDELETE[CASCADE|SETNULL] 参照完整性是通过使用如下保留字:FOREIGN KEY 定义那些列为外码; REFERENCES 指明外键对应于哪个表的主键;ON DELETE CASCADE 指明删除被参照关系的元组时,同时删除参照关系中的元组;SETNULL表示置为空值方式。本试题中,部门关系的主键为部门号,...
创建user 表: CREATETABLEuser(idINTNOTNULLAUTO_INCREMENT,usernameVARCHAR(30)NOTNULL,passwordVARCHAR(20)NOTNULL,emailVARCHAR(30)NOTNULL,cellphoneCHAR(11),ipCHAR(15)NOTNULL,PRIMARYKEY(id)); 创建order 表: CREATETABLE`order`(oidINTNOTNULLAUTO_INCREMENT,uidINTreferencesuser(id),order_noCHAR(11)NOTNUL...
Bug #694 Foreign keys "REFERENCES user(id)" Submitted: 21 Jun 2003 0:30Modified: 25 Jun 2003 5:32 Reporter: [ name withheld ] Email Updates: Status: Closed Impact on me: None Category: MySQL ServerSeverity: S3 (Non-critical) Version: 4.0.13OS: Windows (Win2K) Assigned to: CPU ...
REFERENCES是固定格式。master(cust_id)指定外键的父表名称,案例中是定父表为master数据表。()中输入的是,父表内的指定字段名称,案例中是定父表内的cust_id字段。mysql> DESC slave;+———–+———–+——+—–+———+——-+| Field | Type | Null | Key | Default | Extra |+———–+—...