该消息是什么意思，我该如何修复我的代码？答案

【问题标题】：What does the message mean and how do i fix my code?该消息是什么意思，我该如何修复我的代码？
【发布时间】：2016-02-03 09:15:36
【问题描述】：

您的 SQL 语法有错误；检查手册与您的 MySQL 服务器版本相对应，以便使用正确的语法靠近''students'('subject_id') ON UPDATE CASCADE ON DELETE CASCADE FOREIGN KEY（第 8 行的主题

CREATE TABLE Entries
 (
entry_id int NOT NULL,
subject_id int NOT NULL,
student_id int NOT NULL,
exam_date int,
PRIMARY KEY (subject_id),
FOREIGN KEY (student_id) REFERENCES 'students'('student_id')
ON UPDATE CASCADE ON DELETE CASCADE 
FOREIGN KEY (subject_id) REFERENCES 'subjects'('subject_id')
ON UPDATE CASCADE ON DELETE CASCADE 
)

【问题讨论】：

标签： mysql foreign-keys scientific-computing

【解决方案1】：

您必须删除列和表名周围的单引号：

CREATE TABLE Entries
 (
entry_id int NOT NULL,
subject_id int NOT NULL,
student_id int NOT NULL,
exam_date int,
PRIMARY KEY (subject_id),
FOREIGN KEY (student_id) REFERENCES students(student_id)
ON UPDATE CASCADE ON DELETE CASCADE 
)

而且也不需要两次添加密钥

【讨论】：