Creating your first trigger
You have been hired by the company Fresh Fruit Delivery to help secure their database and ensure data integrity. The company sells fresh fruit to other online shops, and they use several tables to keep track of stock and placed orders.
One of their tables (Discounts) specifies the discount amount that shops receive when placing large orders. A deletion of several hundred rows happened at some point in the past when one of their employees removed some orders by mistake.
They need a new trigger on the Discounts table to prevent DELETE statements related to the table, and this is where you can help.
この演習はコースの一部です
Building and Optimizing Triggers in SQL Server
演習の手順
- Create a new trigger on the
Discountstable. - Use the trigger to prevent
DELETEstatements.
実践的なインタラクティブ演習
このサンプルコードを完成させて、この演習に挑戦してみましょう。
-- Create a new trigger that fires when deleting data
___ TRIGGER PreventDiscountsDelete
ON Discounts
-- The trigger should fire instead of DELETE
___ ___ DELETE
AS
PRINT 'You are not allowed to delete data from the Discounts table.';