SQL Jak zsumować z innej tabeli i wstawić do innej tabeli

Dodaj ten wyzwalacz do tabeli wydatków

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

Nie zapomnij dodać wyzwalacza After Update i After Delete zaktualizować ExpenseTotal