A trigger for give a discount of 10 percent for a regular customer

Hello

I am trying to create a trigger to give a 10% discount on the 'TotalCost' field in the table of reservations, if the 'statusname' is regular in the table of passengers. Here's what I come up with so far. But I know that its bad. Can you please help?

create or replace TRIGGER Ten_Percent_Discount 
BEFORE UPDATE ON Bookings
FOR EACH ROW
BEGIN
UPDATE Bookings b
SET b.TotalCost = 0.10 * TotalCost
WHERE Passengers.StatusName = 'Regular';
END;

Thank you

Fareedh

Assuming you have a passenger_id in your table reservations probably use something like this

Eate or replace TRIGGER Ten_Percent_Discount
BEFORE the update ON bookings
FOR EACH LINE

CURSOR C_Passengers
IS
SELECT Status_Name
OF passengers
WHERE Passenger_Id =: NEW. Passenger_Id
;

l_status_name Passengers.Status_Name%TYPE;

BEGIN

OPEN C_Passengers.
Look FOR C_Passengers IN l_status_name;
CLOSE C_Passengers;
 
IF l_status_name = "Normal".
THEN
: New.total_cost = 0.90 *: New.Total_Cost;
END IF;

END;

Tags: Database

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