I am having an issue creating this function with a trigger using postgreSQL (plpgsql). Could someone please help me solve this?

Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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I am having an issue creating this function with a trigger using postgreSQL (plpgsql). Could someone please help me solve this? Thank you!

 

CREATE OR REPLACE FUNCTION Moreno_03_bankTriggerFunction()
RETURNS TRIGGER
LANGUAGE PLPGSQL
AS
$$
BEGIN
CREATE TRIGGER Moreno_03_bankTrigger
AFTER DELETE ON account
FOR EACH ROW
WHERE depositor.account_number = account.account_number
EXECUTE PROCEDURE Moreno_15_bankTriggerFunction();
END;
$$

Database Schema:

branch ( branch_name, branch_city, assets )

customer ( ID, customer_name, customer_street, customer_city )

loan ( loan_number, branch_name, amount )

borrower ( ID, loan_number )

account ( account_number, branch_name, balance )

depositor ( ID, account_number )

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