Question

我正在尝试将文本文件中的数据插入到具有外键的表中，而另一个表已经加载了数据。出于某种原因，虽然我似乎无法在这个新表中插入任何内容。

这是我用来创建表格的代码：

CREATE TABLE GENRE
(
genre_name varchar(255) NOT NULL,
PRIMARY KEY (genre_name)
);

CREATE TABLE BOOK
(
isbn int NOT NULL,
title varchar(255) NOT NULL,
price DECIMAL(11,2) NOT NULL,
genre_nm varchar(255) NOT NULL,
PRIMARY KEY (isbn),
CONSTRAINT fk_BOOK FOREIGN KEY (genre_nm)
REFERENCES GENRE(genre_name)
);

然后我的INSERT语句：

INSERT INTO BOOK 
->   (isbn,title,genre_nm,price) 
->  VALUES 
->   (582394706,'I Shall Be Near to You: A Novel','drama',25.31),
->   (199978896,'A Breath of Frost ','fiction',41.99),
->   (506705707,'The Death Class: A True Story About Life','psychology',25.99),
->   (582553303,'The Walking Dead','comics',18.67),
->   (780701543,'Anna Karenina','drama',29.99),
->   (213261709,'A bad day','drama',14.98),
->   (457697612,'Believe in yourself','psychology',97.12),
->   (99897086,'A place behind the pines','fiction',24.23),
->   (729326086,'Near empty','comics',9.99);

错误：

ERROR 1452 (23000): Cannot add or update a child row: a foreign key constraint fails
(`homework`.`book`, CONSTRAINT `book_ibfk_1` FOREIGN KEY (`genre_nm`) REFERENCES `GENRE`
(`genre_name`))

任何帮助将不胜感激！谢谢！

mysql> SELECT * FROM GENRE; 
+-------------+ 
| genre_name  |
+-------------+ 
| comics      | 
| drama       | 
| fiction     |
| psychology  |
+-------------+ 
4 rows in set (0.00 sec –

外键约束MySql的问题

0 个答案: