Unable to create a table with foreign key. Error: ORA-00904: : invalid identifier

Question

我正在尝试创建一个 table，它在名为 'country' 的 table 中有一个外键，如下所示：

CREATE TABLE country (
   name varchar2(50),
   region varchar2(60),
   area number(10,0),
   population number(11,0),
   gdp number,
   CONSTRAINT country_PK primary key (name)
 );

每次我尝试在我的 'City' 创建 table 中引用 'country' 时，我都会收到此错误 ORA-00904:: 无效标识符。有人可以告诉我我做错了什么吗？谢谢。

CREATE TABLE City(
CityName varchar2(50) not null,
CityCountry varchar2(60),
CityPopulation number(11,0),
IsCapital char(1),
CONSTRAINT CityName_pk PRIMARY KEY (CityName),
CONSTRAINT CityCountry_fk FOREIGN KEY (CityCountry) REFERENCES country (name),
);

Answer 1

从 Country table DDL

的最后一行中删除结尾的逗号 ,

CONSTRAINT CityCountry_fk FOREIGN KEY (CityCountry) REFERENCES country (name),

应该变成：

CONSTRAINT CityCountry_fk FOREIGN KEY (CityCountry) REFERENCES country (name)

Unable to create a table with foreign key. Error: ORA-00904: : invalid identifier

Unable to create a table with foreign key. Error: ORA-00904: : invalid identifier

sql

oracle

identifier

ora-00904