为什么缺少关键字错误？

Question

CREATE TABLE SORDER (
    C_NO CHAR(4),
    P_NO CHAR(4),
    QUANTITY SMALLINT,
    PRIMARY KEY (C_NO, P_NO),
    CONSTRAINT CNO_FK FOREIGN KEY (C_NO) REFERENCES CUSTOMER ON DELETE RESTRICT,
    CONSTRAINT PNO_FK FOREIGN KEY (P_NO) REFERENCES PRODUCT2 ON DELETE RESTRICT
);

ORA-00905:缺少关键字

这是另外两个表btw.

CREATE TABLE PRODUCT2 (
    P_NO CHAR(4) PRIMARY KEY,
    P_NAME CHAR(6),
    PRICES DECIMAL(3,2),
    STOCK SMALLINT
);

CREATE TABLE CUSTOMER2 (
    C_NO CHAR(4) PRIMARY KEY,
    C_NAME CHAR(6),
    CITY CHAR(11)
);

Answer 1

Oracle仅支持ON DELETE SET NULL或ON DELETE CASCADE作为关键字.功能ON DELETE RESTRICT是通过省略ON DELETE

CREATE TABLE SORDER (
    C_NO CHAR(4),
    P_NO CHAR(4),
    QUANTITY SMALLINT,
    PRIMARY KEY (C_NO, P_NO),
    CONSTRAINT CNO_FK FOREIGN KEY (C_NO) REFERENCES CUSTOMER2,
    CONSTRAINT PNO_FK FOREIGN KEY (P_NO) REFERENCES PRODUCT2
);

有关详细信息,请参阅手册:http://docs.oracle.com/cd/B28359_01/server.111/b28286/clauses002.htm#CJABCJJF

从手册中引用:

ON DELETE子句使您可以确定在删除引用的主键或唯一键值时Oracle数据库如何自动维护引用完整性.如果省略此子句,则Oracle不允许您删除父表中具有子表中的从属行的引用键值

这是一个SQLFiddle:http://sqlfiddle.com/#!4/07e93/1