我有一个date_dimension表定义：

CREATE TABLE date_dimension
(
  id integer primary key,
  date text,
  year double precision,
  year_for_week double precision,
  quarter double precision
);

我正在尝试创建fact失败的表

create table fact ( 
  id serial primary key,
  contract integer,
  component integer,
  evaluation_date integer,
  effective_date integer,
  foreign key (evaluation_date, effective_date) references date_dimension(id, id)
);

错误是：

ERROR:  there is no unique constraint matching given keys for referenced 
table "date_dimension"

SQL state: 42830

我不确定如何解决此问题。