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From: Laurenz Albe <[email protected]>
To: [email protected]
Subject: Trigger violates foreign key constraint
Date: Mon, 02 Oct 2023 09:03:33 +0200
Message-ID: <[email protected]> (raw)

CREATE TABLE parent (id integer PRIMARY KEY);

CREATE TABLE child (id integer REFERENCES parent ON DELETE CASCADE);

CREATE FUNCTION silly() RETURNS trigger LANGUAGE plpgsql AS 'BEGIN RETURN NULL; END;';

CREATE TRIGGER silly BEFORE DELETE ON child FOR EACH ROW EXECUTE FUNCTION silly();

INSERT INTO parent VALUES (1);

INSERT INTO child VALUES (1);

DELETE FROM parent WHERE id = 1;

TABLE child;
 id 
════
  1
(1 row)

The trigger function cancels the cascaded delete on "child", and we are left with
a row in "child" that references no row in "parent".

Yours,
Laurenz Albe

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