Please allow me to delete all campers with no season

Question

I am trying to delete all the campers in a period that do not have any season assigned.

I tried using the Mass Update Tab and selecting "!!Is Empty!!" but it says "0" records.

Answer 1

!!IsEmpty!! Only works for change option.

So first change it to something and then delete.

Answer 2

you can make a query of all empty and check the box use query