SQL錯誤：ORA-02270：製作表時出錯

Question

這些表是我迄今爲止的表，錯誤是表SESSIONS，我似乎無法找到錯誤是什麼？我輸入了主鍵和外鍵錯了嗎？

CREATE TABLE BRANCH(
BRANCHID CHAR(2) NOT NULL, 
BRANCHNAME VARCHAR2(20), 
BRANCHSUBURB VARCHAR2(15), 
BRANCHPOSTCODE CHAR(4), 
CONSTRAINT BRANCH_PK PRIMARY KEY(BRANCHID)); 

CREATE TABLE SCREEN(
CHAR(2) NOT NULL, 
SCREENID CHAR(2) NOT NULL, 
SCREENCAPACITY NUMBER(3), 
CONSTRAINT SCREEN_PK PRIMARY KEY(BRANCHID, SCREENID), 
CONSTRAINT SCREEN_FK FOREIGN KEY(BRANCHID) REFERENCES BRANCH(BRANCHID)); 

CREATE TABLE MOVIE(
MOVIEID CHAR(2) NOT NULL, 
MOVIENAME VARCHAR2(20), 
MOVIEGENRE VARCHAR2(20), 
MOVIECLASSIFICATION VARCHAR2(5), 
CONSTRAINT MOVIE_PK PRIMARY KEY(MOVIEID)); 

CREATE TABLE SESSIONS(
SESSIONID CHAR(4) NOT NULL, 
BRANCHID CHAR(2) NOT NULL, 
SCREENID CHAR(2) NOT NULL, 
MOVIEID CHAR(2) NOT NULL, 
SESSIONDATE DATE, 
SESSIONPRICE NUMBER(4,2), 
CONSTRAINT SESSIONS_PK PRIMARY KEY(SESSIONID, BRANCHID, SCREENID, MOVIEID), 
CONSTRAINT SESSIONS_FK1 FOREIGN KEY(BRANCHID) REFERENCES BRANCH(BRANCHID), 
CONSTRAINT SESSIONS_FK2 FOREIGN KEY(SCREENID) REFERENCES SCREEN(SCREENID), 
CONSTRAINT SESSIONS_FK3 FOREIGN KEY(MOVIEID) REFERENCES MOVIE(MOVIEID)); 

Answer 1

對於SCREEN，您有一個複合主鍵。因此，問題是這樣的：

CONSTRAINT SESSIONS_FK2 FOREIGN KEY(SCREENID) REFERENCES SCREEN(SCREENID), 

您可以輕鬆地解決這個問題，因爲你也有BRANCHID：

CONSTRAINT SESSIONS_FK2 FOREIGN KEY(SCREENID, BRANCHID) REFERENCES SCREEN(SCREENID, BRANCHID),