Hmmm, opposite ends of the country. Though a train takes about 4 and a half hours and costs roughly 360 kr.
DSB Train Times Website is a good site to check.
Or I'm sure you can get flights too....
Just checked
Sterling.dk and you can get a flight from Copenhagen to Aalborg on the morning of the 8th of November at 0700 hours for 319 kr. Only takes 45 mins so you'd have all day to spend in Aalborg. There are later flights but they are more expensive at around 449 kr.
Hope that helps
xx Kirsty