MySQL多對多關系

Question

無法創建最后一個表：(在我看來，答案應該非常簡單，但不幸的是找不到它。這是代碼：

CREATE TABLE Topics ( topicId INT NOT NULL AUTO_INCREMENT, 
        topicName VARCHAR(50) NOT NULL,
        submdate DATE NOT NULL,
        accdate DATE NOT NULL, 
        comm VARCHAR(100), 
        status varchar(1) CHECK (status>0 and status<4),
        PRIMARY KEY (topicId) );


CREATE TABLE Student ( studentId INT NOT NULL AUTO_INCREMENT,
        studentname VARCHAR(50) NOT NULL,
        PRIMARY KEY (studentId) );  


CREATE TABLE TopicStudent ( topicId INT NOT NULL,
            studentId INT NOT NULL,
            PRIMARY KEY (topicId, studentId),
            CONSTRAINT Constr_TopicStudent_Student_fk
                FOREIGN KEY Student_fk (studentId) REFERENCES Student (studentId)
                ON DELETE CASCADE ON UPDATE CASCADE,
            CONSTRAINT Constr_TopicStudent_Topic_fk
                FOREIGN KEY Topic_fk (topicId) REFERENCES Topic (topicId)
                ON DELETE CASCADE ON UPDATE CASCADE
            );

錯誤1064（42000）：您的SQL語法有錯誤； 在第1行的“ Const r_TopicStudent_Student_fk FOREIGN KEY Student_fk（studentId）參考Stu”附近，查看與您的MySQL服務器版本相對應的手冊以使用正確的語法。

Answer 1

Const r_TopicStudent ？ “ Const”和“ r_TopicStudent”之間是否有空格？