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To be fair they are warnings not errors But have a look here: Null value is eliminated by an aggregate or other SET
Do you have any custom SQL code? Or if not, can you narrow down the times these warnings occur with perhaps rules you have which run. Maybe time-based or advanced functions.
Thanks Nicolas, you are correct that they are warnings and it appears that they can be ignored. I appreciate your help! I will try to see if any business rules operate at those log times and see if I can locate the issue but now I realize that it's not anything that I did wrong. Also I'm not executing custom SQL so it probably is a rule of some sort.