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我在pgAdmin 4中创建了一些表格,但由于某种原因,我一直收到错误的标题,你能发现原因吗?我没有看到任何问题,并且我已经查看了与我的完全编译的类似的其他代码示例。它也在IDEone(http://ideone.com/ZBn2Nr)中运行正常。在PostgreSql中获取“外键不同意的引用和引用列的数量”
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);
所以我要改变这条线 - 外键(RNO)引用收据(RNO)?我只是试图做到这一点,但它给了我另一个错误,这次是:错误:语法错误处于或接近“foreign” –
您可能意外删除了逗号。您还需要使Receipt.rno具有唯一性。 http://sqlfiddle.com/#!17/e1592 – Eelke