Trigger in postgres

Question

Good day,

I will appreciate any help that you may provide for the problem I am working on.

I have two tables below:

create table account (
account_number varchar(1000), 
branch_name varchar(1000), 
balance numeric(9,2)
);

insert into account (account_number, branch_name, balance) values ('acc1', 'Branch1', 100000);
insert into account (account_number, branch_name, balance) values ('acc2', 'Branch2', 150000);

create table depositor (cust_ID integer, account_number varchar(1000));
insert into depositor (cust_ID, account_number) values (1, 'acc1');
insert into depositor (cust_ID, account_number) values (2, 'acc2');
insert into depositor (cust_ID, account_number) values (3, 'acc3');

The task is to create a SQL trigger to carry out the following action: If an account is deleted, then write a trigger to delete the dependent tuple(s) from the depositor table for every owner of the deleted account .

Here is my progress - I assume there is a need to create function and appropriate trigger:

CREATE FUNCTION my_function() RETURNS TRIGGER AS $_$
BEGIN
    DELETE FROM depositor WHERE depositor.account_number = OLD.account_number;
    RETURN NEW;
END;
$_$ LANGUAGE 'plpgsql';


CREATE TRIGGER my_trigger
BEFORE DELETE ON account 
FOR EACH ROW 
EXECUTE PROCEDURE my_function();

But I get the following error message: "stack depth limit exceeded"

Thanks in advance for your help.

Answer 1

That is not the fault of the trigger you are showing. There must be another trigger on depositor (or on account ) that causes recursion.