Phần II_p228_Q3 và Q4

--3.
sp_helptext InsertSales

--4.
alter trigger UpdateTitleAdvance
on titles with encryption
for update
as
if (select advance from inserted)>15000
begin
print 'Gia tri cua cot advance phai nho hon 15000'
rollback transaction
end

sp_helptext UpdateTitleAdvance