简单的触发器问题

初学
                                                  触发器                                              
[解决办法]
可能是空格全角问题

if (exists (select * from sys.objects where name = 'stop_Delete_Customer'))
    drop trigger stop_Delete_Customer
go
create trigger stop_Delete_Customer
on T_customer
for insert 
as
begin
print 'hello world'
end