I have a uquery where I select and sort courses by datetime, but some of the courses dosen't have any datetime so these I want to come in the bottom of the list.

Im doing somthing like this List

But I get no courses out it's like it tries to order all in the database before it give me a list of items, then it fails because some have no data and then it can't sort the items.

I tried with out the sort and then it works but I have a scroll function that loads more nodes and then the new items isent sorted with the first items. this is a problem.

Hope anyone can help me ! :D