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我一直收到一个错误,指出外键引用列表中的列数不等于引用列表中的列数。oracle引用列的数量必须与引用列匹配
这是我得到的错误。
foreign key(EID, Lastname, Firstname, Midinitial) references employee,
有谁知道为什么我得到这个错误?
create table employee(
EID varchar(20) primary key,
Lastname varchar(20),
Firstname varchar(20),
Midinitial char(1),
gender char(1),
street varchar(20),
city varchar(20)
);
create table works(
EID varchar(20) primary key,
Lastname varchar(20),
Firstname varchar(20),
Midinitial char(1),
company_name varchar(20),
salary numeric(5,0),
foreign key(EID, Lastname, Firstname, Midinitial) references employee,
foreign key(company_name) references company
);
create table company(
company_name varchar(20) primary key,
city varchar(20),
foreign key(city)references employee
);