小编eCo*_*Evo的帖子

我正在尝试构建一个触发器函数，以便在任何项目发生更改时自动更新父订单值。

这是我创建的：

CREATE OR REPLACE FUNCTION update_totals() RETURNS void AS $$
    UPDATE orders SET
       total_fees = (SELECT SUM(fees) FROM order_items WHERE order_id = OLD.order_id),
       total_profit = (CASE WHEN total_cost IS NOT NULL THEN total - total_tax - total_cost - (SELECT SUM(fees) FROM order_items WHERE order_id = OLD.order_id) ELSE NULL END)
    WHERE id = OLD.order_id;
$$
LANGUAGE SQL;

CREATE TRIGGER update_totals AFTER INSERT 
OR UPDATE OF fees
ON order_items INITIALLY DEFERRED
FOR EACH ROW
WHEN ( OLD.* IS DISTINCT FROM NEW.* …