MySql外鍵不正確

我正在使用xampp（localhost）和mysql爲項目製作數據庫，但我有一個外鍵問題，我不能找到我的錯誤，當我試圖創建一個學生登記表是我得到的消息： ＃1005 - 無法創建表X。 studentenrolment（錯誤：150「外鍵約束的格式不正確」）MySql外鍵不正確

我的表編號：

CREATE TABLE LOGINFO (
STUDENTNUMBER NUMERIC(9) NOT NULL, 
PASS CHAR(12), 
CONSTRAINT LOGINFO_PRIMARY_KEY PRIMARY KEY (STUDENTNUMBER)); 

CREATE TABLE LEADERS(
MODULESLEADER CHAR(16) NOT NULL, 
LEADERSOFFICE CHAR(16) , 
LEADERSEMAIL CHAR(16) , 
LEADERSPHONE numeric(4), 
CONSTRAINT LEADERS_PRIMARY_KEY PRIMARY KEY (MODULESLEADER)); 

CREATE TABLE MODULES(
MODULESLEADER CHAR(16) NOT NULL, 
MODULECODE CHAR(6) NOT NULL , 
MODULEDESCRIPTION CHAR(16) , 
LECTURESLOT CHAR (16), 
LECTUREROOM CHAR(4) , 
CONSTRAINT MODULES_FOREIGN_KEY FOREIGN KEY (MODULESLEADER) REFERENCES LEADERS (MODULESLEADER), 
CONSTRAINT MODULES_PRIMARY_KEY PRIMARY KEY (MODULESLEADER,MODULECODE)); 

CREATE TABLE STUDENTENROLMENT(
STUDENTNUMBER NUMERIC(9) NOT NULL, 
MODULECODE CHAR(6) NOT NULL , 
CONSTRAINT STUDENTENROLMENT_FOREIGN_KEY FOREIGN KEY (STUDENTNUMBER) REFERENCES LEADERS (STUDENTNUMBER), 
CONSTRAINT STUDENTENROLMENT_FOREIGN_KEY FOREIGN KEY (MODULECODE) REFERENCES MODULES (MODULECODE), 
CONSTRAINT STUDENTENROLMENT_PRIMARY_KEY PRIMARY KEY (STUDENTNUMBER, MODULECODE));

我試圖小時找到什麼是我的語法錯誤，但我不能找到它，我試過很多其他的方法，如：

CONSTRAINT STUDENTENROLMENT2_FOREIGN_KEY FOREIGN KEY (MODULECODE) REFERENCES MODULES (MODULECODE)

預先感謝您！

來源

2017-01-14 V.V.

我認爲FOREIGN KEY（STUDENTNUMBER）應該指定LOGINFO表。
也許this question可以幫助

看來，這個代碼不會導致錯誤：

CREATE TABLE LOGINFO (
    STUDENTNUMBER NUMERIC(9) NOT NULL, 
    PASS CHAR(12), 
    CONSTRAINT LOGINFO_PRIMARY_KEY PRIMARY KEY (STUDENTNUMBER)); 

CREATE TABLE LEADERS(
    MODULESLEADER CHAR(16) CHARACTER SET utf8 NOT NULL, 
    LEADERSOFFICE CHAR(16) , 
    LEADERSEMAIL CHAR(16) , 
    LEADERSPHONE numeric(4), 
    CONSTRAINT LEADERS_PRIMARY_KEY PRIMARY KEY (MODULESLEADER)); 

CREATE TABLE MODULES(
    MODULESLEADER CHAR(16) CHARACTER SET utf8 NOT NULL, 
    MODULECODE CHAR(6) CHARACTER SET utf8 NOT NULL , 
    MODULEDESCRIPTION CHAR(16) , 
    LECTURESLOT CHAR (16), 
    LECTUREROOM CHAR(4) , 
    CONSTRAINT MODULES_FOREIGN_KEY FOREIGN KEY (MODULESLEADER) REFERENCES LEADERS (MODULESLEADER), 
    CONSTRAINT MODULES_PRIMARY_KEY PRIMARY KEY (MODULECODE, MODULESLEADER)); 



CREATE TABLE STUDENTENROLMENT 
(
    STUDENTNUMBER NUMERIC(9) NOT NULL, 
    MODULECODE CHAR(6) CHARACTER SET utf8 NOT NULL, 
    CONSTRAINT STUDENTENROLMENT_MODULES_MODULECODE_fk FOREIGN KEY (MODULECODE) REFERENCES MODULES (MODULECODE) 
,CONSTRAINT STUDENTENROLMENT_LOGINFO_STUDENTNUMBER_fk FOREIGN KEY (STUDENTNUMBER) REFERENCES LOGINFO (STUDENTNUMBER), 
    CONSTRAINT STUDENTENROLMENT_PRIMARY_KEY PRIMARY KEY (STUDENTNUMBER, MODULECODE) 
);

來源

2017-01-14 19:57:27

MySql外鍵不正確

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