create table qq(id int primary key not null auto_increment,num varchar(15) not null);
然後我插入了一條資料:
insert into qq(id,num) values (1,5555);
我又建了一個表 設定了一個外鍵指向qq表的id
create table sqq(id int primary key not null auto_increment,num varchar(15) not null,comment varchar(140) not null,constraint foreign key(id) references qq(id));
我插入一條資料
insert into sqq(id,num,comment) values (1,5555,'ssss');
但是我再次插入第二條資料時就報錯了
insert into sqq(id,num,comment) values (2,5555,'vvvv');
ERROR 1452 (23000): Cannot add or update a child row: a foreign key constraint fails (t1
.sqq
, CONSTRAINT sqq_ibfk_1
FOREIGN KEY (id
) REFERENCES qq
(id
))
回複內容:
create table qq(id int primary key not null auto_increment,num varchar(15) not null);
然後我插入了一條資料:
insert into qq(id,num) values (1,5555);
我又建了一個表 設定了一個外鍵指向qq表的id
create table sqq(id int primary key not null auto_increment,num varchar(15) not null,comment varchar(140) not null,constraint foreign key(id) references qq(id));
我插入一條資料
insert into sqq(id,num,comment) values (1,5555,'ssss');
但是我再次插入第二條資料時就報錯了
insert into sqq(id,num,comment) values (2,5555,'vvvv');
ERROR 1452 (23000): Cannot add or update a child row: a foreign key constraint fails (t1
.sqq
, CONSTRAINT sqq_ibfk_1
FOREIGN KEY (id
) REFERENCES qq
(id
))
先insert into qq(id,num) values (2,5555);然後insert into sqq(id,num,comment) values (2,5555,'vvvv');
至於為什嗎?提示裡已經寫的很清楚了