Question

我是sql的新手...对于我的任务我正在尝试在级联上设置更新并在级联上删除。然而，它给我一个错误，说它错过了一个关键词

这是我的代码：

DROP TABLE BEACH;
DROP TABLE OCEANS; 

CREATE TABLE OCEANS
(OceanTitle          VARCHAR(18),  
AverageDepth         NUMBER(8),
PrecentOfSurface     NUMBER(8),
CONSTRAINT OCEANS_OceanTitle_pk PRIMARY KEY (OceanTitle));

CREATE TABLE BEACH
(BeachTitle          VARCHAR(18),  
State                VARCHAR(18), 
CONSTRAINT BEACH_BeachTitle_pk PRIMARY KEY (BeachTitle),
CONSTRAINT BEACH_OceanTitle_fk FOREIGN KEY(OceanTitle) REFERENCES OCEANS(OceanTitle),  
OceanTitle VARCHAR(18) REFERENCES OCEANS(OceanTitle) ON update CASCADE,
OceanTitle VARCHAR(18) REFERENCES OCEANS(OceanTitle) ON delete CASCADE 
);

INSERT INTO OCEANS VALUES ('Pacific', 13740, 48);
INSERT INTO OCEANS VALUES ('Atlantic', 12254, 28);
INSERT INTO OCEANS VALUES ('Gulf', 5299, 1);
INSERT INTO BEACH VALUES ('Manele Bay', 'Hawaii', 'Pacific');

INSERT INTO BEACH VALUES ('Myrtle Beach', 'South Carolina', 'Atlantic');
INSERT INTO BEACH VALUES ('Nantucket', 'Massachusetts', 'Atlantic');
INSERT INTO BEACH VALUES ('Clearwater Beach', 'Florida', 'Gulf');
INSERT INTO BEACH VALUES ('Coronado', 'California', 'Pacific');

错误消息：

OceanTitle VARCHAR(18) REFERENCES OCEANS(OceanTitle) ON update CASCADE,
                                                        *
ERROR at line 6:
ORA-00905: missing keyword

Answer 1

您的陈述中的问题是On Update Cascade，这在Oracle中不可用。

删除后重新执行您的声明。

Answer 2

正如之前的回答所述，Oracle中没有On Update Cascade。

以下是一些解决方法：

http://www.dba-oracle.com/oracle_tips_cascade_update.htm

（tom kyte script）http://tkyte.blogspot.ro/2009/10/httpasktomoraclecomtkyteupdatecascade.html

受限制的约束 http://www.java2s.com/Tutorial/Oracle/0120__Table/DeferredConstraints.htm

希望这会有所帮助 - 祝你好运

我在sql update和delete上得到了ERROR

2 个答案: