sql - 甲骨文 : Foreign Key Error : Unknown Command

Question

每次我尝试制作外键或尝试执行 ON DELETE CASCADE

我收到这样的错误:

Error starting at line 9 in command:
CONSTRAINT tp_landlordrole_FK FOREIGN KEY (zillowuseraccountid)
Error report:
Unknown Command

下面是我的代码示例

PROMPT 'Creating Table landlordrole'
CREATE TABLE tp_landlordrole
(
    landlordroleid          NUMBER(20) NOT NULL,
    zillowuseraccountid         NUMBER(20) NOT NULL,
    numberofpropertiesowned     Number(6),
CONSTRAINT tp_landlordrole_PK PRIMARY KEY ( landlordroleid ) ) ; 

CONSTRAINT tp_landlordrole_FK FOREIGN KEY (zillowuseraccountid)
    REFERENCES  tp_zillowuseraccount(zillowuseraccountid) ON DELETE CASCADE  ;

PROMPT Creating Index 'tp_landlordrole_I'
CREATE INDEX tp_landlordrole_I ON tp_landlordrole
( zillowuseraccountid );

PROMPT 'Creating Sequence tp_landlordroleid_seq for the tp_landlordrole table'
CREATE SEQUENCE tp_landlordroleid_seq START WITH 0 MINVALUE 0 NOCACHE;

欢迎提出任何建议!!

Answer 1

我相信你只需要一个alter table语句:

ALTER TABLE tp_landlordrole 
    ADD CONSTRAINT tp_landlordrole_FK
        FOREIGN KEY (zillowuseraccountid) REFERENCES  tp_zillowuseraccount(zillowuseraccountid) ON DELETE CASCADE  ;

但是，您可以直接在表定义中定义外键。

CREATE INDEX 和CREATE SEQUENCE 不需要ALTER TABLE。