PostgreSQL中复合类型列子列的外键约束

Question

有没有办法将复合类型列的子列设置为外键？

我试过的是：

Create Type info_typ_ AS (
  category integer ,
  title text ,
  actor text ,
  price double precision );

Create Table Products_typobj (
prod_id integer,
info info_typ_,
primary key(prod_id),
Category references Categories(Category)
);

但它不起作用。

Answer 1

这项工作对我来说

Create Type info_typ_ AS (
  category integer ,
  title text ,
  actor text ,
  price double precision );

Create Table Products_typobj (
prod_id integer,
info info_typ_,
primary key(prod_id)
);

我删除了references行，因此使用type有效。 的 SQL Fiddle DEMO

如果您需要外键，请尝试以下代码：

Create Type info_typ_ AS (
  category integer ,
  title text ,
  actor text ,
  price double precision );

Create Table Categories (
  Category int,
  primary key(Category)
);  

Create Table Products_typobj (
prod_id integer,
info info_typ_,
Category int references Categories(Category),  
primary key(prod_id),
FOREIGN KEY (Category) REFERENCES Categories (Category)
);

<强> SQL Fiddle DEMO