Необходимо создать триггер на удалениеНе нужно.
ALTER TABLE [dbo].[PerformerGenre]
WITH NOCHECK ADD CONSTRAINT [FK_PerformerGenre_Genre] FOREIGN KEY([Genre])
REFERENCES [dbo].[Genre] ([ID])
ON DELETE CASCADE
в курсовой требуется
CREATE TRIGGER deleted_otmetki ON student FOR DELETE
AS
DELETE FROM otmetki WHERE otmetki.kod_studenta = deleted.kod_studenta
GO