在PostgreSql中獲取“外鍵的引用和被引用列數不同”

Question

我在pgAdmin 4中創建了一些表，但是由於某種原因，我一直收到標題為錯誤的信息，您能找出原因嗎？ 我沒有看到任何問題，我已經研究了與我的類似的代碼示例，它們完美地進行了編譯。 它還可以在IDEone（ http://ideone.com/ZBn2Nr ）中正常運行。

謝謝！

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);

Answer 1

如果您沒有在references子句中指定列列表，它將擴展為被引用表的主鍵。

例如：

foreign key(rno) references Receipt

擴展到

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

所以列數不​​匹配