主页 / coding / 问题 / 76934477
Accepted
Salih Kavaf
Asked: 2023-08-19 17:46:46 +0800 CST

如何在同一个表的派生部分引用主键？

  • 772

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_idto的外键引用payments.id，使其不引用其他继承表？

换句话说，我该如何参考subscription_payments.id？

database

1 个回答

  1. Best Answer

    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
)
    • 1

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