sql - 在PostgreSQL中获取 “number of referencing and referenced columns for foreign key disagree”

我在pgAdmin 4中创建了一些表，但是由于某种原因，我一直收到错误消息标题，您能找出原因吗？我没有发现任何问题，我已经研究了与我的代码类似的完美编译的示例代码。它也可以在IDEone(http://ideone.com/ZBn2Nr)中运行。

谢谢!

Create table item
    (iname varchar(30) primary key,
    itype varchar(30));

Create table Cafe
    (license numeric(5,0) primary key,
    cname varchar(30),
    address varchar(30));

Create table Client
    (cid numeric(5,0) primary key,
    name varchar(30),
    phone numeric(9,0));

Create table Likes
    (cid numeric(5,0),
    iname varchar(30),
    primary key(cid,iname),
    foreign key(cid) references Client,
    foreign key(iname) references item);

Create table Sells
    (license numeric(5,0),
    iname varchar(30),
    price float check(price > 0),
    primary key(license,iname),
    foreign key(license) references Cafe,
    foreign key(iname) references item);

Create table Receipt
    (cid numeric(5,0),
    rno numeric(5,0),
    license numeric(5,0),
    rdate date,
    primary key(cid,rno),
    foreign key(cid) references Client,
    foreign key(license) references Cafe);

Create table Buys
    (cid numeric(5,0),
    rno numeric(5,0),
    iname varchar(30),
    amount int check(amount > 0),
    primary key(cid,rno,iname),
    foreign key(cid) references Client,
    foreign key(rno) references Receipt,
    foreign key(iname) references item);

最佳答案

如果您在references子句中未指定列列表，它将扩展为被引用表的主键。

例如:

foreign key(rno) references Receipt

扩展到

foreign key(rno) references Receipt(cid,rno)

所以列数不​​匹配

关于sql - 在PostgreSQL中获取 “number of referencing and referenced columns for foreign key disagree”，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/45346269/