I need to connect two table's data using a trigger

Question

I'm new to sql and I can't figure out this trigger.

First Table is Order_Details which has Three rows,

O_Id
F_Id
Price(Int)

Second Table is Payment_Details which has Two rows,

O_Id
Total_Price(Int)

When a order is placed, the Order_Details cretes multiple rows with different foods(F_Id) with different price (Price) but the same Order number(O_Id). Because a single order can have multiple food items

So I need a Trigger to calculate the sum of all the Food Price(Total_Price) in a Single Order.

Is there any possible trigger for this?

Answer 1

If these are really the only columns you would do better to create it as a view.

CREATE TABLE Order_Details(
O_Id int,
F_Id int,
Price Int);

CREATE VIEW Payment_Details AS
SELECT O_Id,
SUM(Price) AS Total_Price
FROM Order_Details
GROUP BY O_Id;

insert into Order_Details values
(1,1,20),(1,2,15);

select * from Payment_Details;

O_Id | Total_Price
---: | ----------:
   1 |          35

db<>fiddle here