SQL Server 2005 트리거가 작동하지 않습니다.

Question

order_details이라는 테이블과 book_inventory이라는 테이블이 있습니다.

내가 quantity_ordered 인 경우 order_details에서 quantity_in_stock에서 book_inventory으로 그 값을 줄여야합니다. ,

create TRIGGER [dbo].[book] 
    ON [dbo].[order_details] 
    AFTER UPDATE 
AS 

IF UPDATE(quantity_ordered) 
    UPDATE book_inventory 
    SET book_inventory.quantity_in_stock = book_inventory.quantity_in_stock - order_details.quantity_ordered 
    FROM order_details 
    WHERE book_inventory.isbn = order_details.isbn 

Answer 1

확인이 쿼리를 작성하는 적절한 방법은

create TRIGGER [dbo].[book] 
    ON [dbo].[order_details] 
    AFTER UPDATE 
AS 

IF UPDATE(quantity_ordered) 
    UPDATE book_inventory 
    SET book_inventory.quantity_in_stock = book_inventory.quantity_in_stock - i.quantity_ordered + d.quantity_ordered 
    FROM INSERTED i 
    JOIN DELETED d 
     ON d.isbn = i.isbn 
    WHERE book_inventory.isbn = i.isbn