錯誤代碼：1452無法添加或更新子行

Question

我試圖添加此數據。但是，它不允許我。如何添加也與學生相關的成績？

錯誤代碼，似乎是「

錯誤代碼：1452不能添加或更新子行：外鍵約束失敗（universitygrade_report，約束grade_report_ibfk_1外鍵（Student_number）參考文獻STUDENT（Student_number ？））

可能的解決方案

Create database UNIVERSITY; 

USE UNIVERSITY; 


CREATE TABLE STUDENT(
Name VARCHAR(150), 
Student_number INT, 
Class INT, 
Major VARCHAR(50), 
PRIMARY KEY (Student_number) 
); 

CREATE TABLE UNIT (
Unit_name VARCHAR(120), 
Unit_number VARCHAR(20), 
Credit INT, 
School VARCHAR(10), 
PRIMARY KEY (Unit_number) 
); 

CREATE TABLE SECTION (
Section_id INT, 
Unit_number VARCHAR(20), 
Semester INT, 
Year INT, 
Lecturer VARCHAR(150), 
PRIMARY KEY (Section_id), 
FOREIGN KEY (Unit_number) REFERENCES UNIT(Unit_number) 
); 

CREATE TABLE GRADE_REPORT (
Student_number INT, 
Section_id INT, 
Grade INT, 
FOREIGN KEY (Student_number) REFERENCES STUDENT(Student_number), 
FOREIGN KEY (Section_id) REFERENCES SECTION (Section_id) 
); 


INSERT INTO STUDENT 
VALUES 
('Smith', 17, 1, 'CS'), 
('Brown', 8, 2, 'CS’); 

INSERT INTO UNIT 
VALUES 
(‘Intro to CS’, ‘IN101’, 8, ‘CS’), 
(‘Data Structures’, ‘CS302’, 8, ‘CS’), 
(‘Database’, ‘IAB130’, 8, ‘IS’), 
(‘Discrete Maths’, ‘MATH120’, 10, ‘MATH’); 

INSERT INTO SECTION 
VALUES 
(85, ‘IN101’, 1, 2012, ‘Smith’), 
(102, ‘CS302’, 1, 2012, ‘King’), 
(103, ‘IN101’, 2, 2013, ‘Baily’), 
(96, ‘MATH120’, 1, 2012, ‘Jones’); 

問題是在這裏：

INSERT INTO GRADE_REPORT 
VALUES 
(17, 85, 7), 
(8, 103, 5), 
(8, 102, 6), 
(8, 85, 6), 
(9, 85, 5), 
(17, 96, 4); 

Answer 1

ù必須定義的字段爲每個數據目的地這樣

INSERT INTO GRADE_REPORT (`Student_number`,`Section_id`,`Grade`) VALUES (17, 85, 7), (8, 103, 5), (8, 102, 6), (8, 85, 6), (9, 85, 5), (17, 96, 4);