如何在同一个表的派生部分引用主键？

Question

让我们考虑以下两个简化的表格：

CREATE TABLE payments
(
    id bigserial NOT NULL PRIMARY KEY,
    method int,
    method_name name,
    total numeric,
    payment_date timestamp without time zone,
    is_seccessful boolean,
    data jsonb
);

CREATE TABLE subscription_payments
(
    subscription_id int,
    parent_id bigint,

   CONSTRAINT pk_subscription_id FOREIGN KEY (subscription_id)
       REFERENCES subscriptions (id)
       ON DELETE RESTRICT
)
INHERITS (payments);

现在，如何创建

subscription_payments.parent_id

到

payments.id

的外键引用，其中它不会引用其他继承表？

换句话说，我如何参考

subscription_payments.id

？

Answer 1

由于这是一个桥梁，您可以简单地参考付款，这将保证付款已完成

CREATE TABLE subscription_payments
(
    subscription_id int,
    parent_id bigint,
 primary key (subscription_id, parent_id),
   CONSTRAINT fk_subscription_id FOREIGN KEY (subscription_id)
       REFERENCES subscriptions (id)
       ON DELETE RESTRICT,
   CONSTRAINT fk_parent_id  FOREIGN KEY (parent_id )
       REFERENCES payments(id)
       ON DELETE RESTRICT
)