oracle - 在 SQL Developer 中命名已经存在的错误

Question

昨晚我在这段代码上得到了一些帮助，但现在我得到了一个不同的错误。我的教授仍然没有回答我，所以我来找你们。这是代码：

--创建志愿者主管

CREATE TABLE Volunteer_Supervisor
(
PH_Person_ID    Number(10)   NOT NULL,
EM_Person_ID    Number(10)    NOT NULL,
VO_Person_ID    Number(10)   NOT NULL,
End_Date    Date    NOT NULL,
Begin_Date  Date    NOT NULL,
Hours_Worked    Number(4)   NULL,
PWork_Unit_ID    Number(4)   NULL,
PRIMARY KEY (PWork_Unit_ID),
CONSTRAINT CCPHPersonID_FK FOREIGN KEY (PH_Person_ID) References Physician (PH_Person_ID),
CONSTRAINT CCEMPersonID_FK FOREIGN KEY (EM_Person_ID) References Employee (EM_Person_ID),
CONSTRAINT CCVOPersonID_FK FOREIGN KEY (VO_Person_ID) References Volunteer (VO_Person_ID),
CONSTRAINT CCPWorkUnitID_PK FOREIGN KEY (PWork_Unit_ID) References Work_Unit (PWork_Unit_ID)
);

现在我更改了名称，但仍然收到此错误：

错误报告 -

ORA-00955: 名称已被现有对象使用

955. 00000 - “名称已被现有对象使用” *原因：
     *操作：

我错过了什么？

Answer 1

如果您确定不存在这样的表 Volunteer_Supervisor，您可以尝试以下代码 -

CREATE TABLE Volunteer_Supervisor
(
PH_Person_ID    Number(10)   NOT NULL,
EM_Person_ID    Number(10)    NOT NULL,
VO_Person_ID    Number(10)   NOT NULL,
End_Date    Date    NOT NULL,
Begin_Date  Date    NOT NULL,
Hours_Worked    Number(4)   NULL,
PWork_Unit_ID    Number(4)   NULL,
PRIMARY KEY (PWork_Unit_ID),
FOREIGN KEY (PH_Person_ID) References Physician (PH_Person_ID),
FOREIGN KEY (EM_Person_ID) References Employee (EM_Person_ID),
FOREIGN KEY (VO_Person_ID) References Volunteer (VO_Person_ID),
FOREIGN KEY (PWork_Unit_ID) References Work_Unit (PWork_Unit_ID)
);