Tambahkan pemicu ini ke ExpenseTable Anda
CREATE TRIGGER ExpenseSum AFTER INSERT ON ExpenseTable FOR EACH ROW
BEGIN
UPDATE ProjectsTable P
SET ExpenseTotal =
(SELECT SUM(ExpenseAmount) from ExpenseTable
where ExpenseTable.ProjectID= P.ProjectID)
where P.ProjectID = New.ProjectID;
END
Jangan lupa tambahkan pemicu After Update
dan After Delete
untuk memperbarui ExpenseTotal