Alright, so let\'s say I\'m writing a forum application, and I want pretty URLs. However, all my tables use numeric IDs, so I\'m not sure the best way to format the URLs for tho
i would suggest the first one, since the topic title can be changed for clarity, by the admins and then the url will be inconsistent.
www.example.com/topic/123456
also allows one to just edit the last bit of the url (the numbers and jump to another topic), not likely to happen but still a usable feature.