根据列值将行插入另一个表

Question

I have two tables (shipments and stocks).

shipments table (id, item_id, quantity, expiry_date, status)

stocks table (id, shipment_id, item_id, quantity, expiry_date)

status can be either Accepted or Returned .

I want to create a trigger to insert into stocks table only the shipment items that are Accepted

This is my code, i don't know how to achieve this.

DELIMITER //
CREATE TRIGGER insert_stocks AFTER INSERT ON shipments
FOR EACH ROW
BEGIN
 IF shipments.status = 'Accepted' THEN
   INSERT INTO stocks (shipment_id, item_id, quantity, expiry_date)
   VALUES (NEW.shipments, NEW.item_id, NEW.quantity, NEW.expiry_date);
 END IF;
END //
DELIMITER ;

Thanks for the help.

Answer 1

You have the right idea, but when checking the status of the new row you should use the NEW keyword, like you've done in the insert statement.

Additionally, the shipment ID should be takes from NEW.id , not NEW.shipments (which doesn't exist).

IF NEW.status = 'Accepted' THEN
   INSERT INTO stocks (shipment_id, item_id, quantity, expiry_date)
   VALUES (NEW.id, NEW.item_id, NEW.quantity, NEW.expiry_date);
END IF;