How can you find all of the contacts who don’t have a value in a particular property?

✅  The correct answer is:

Add a filter for that property and set it to “Is Unknown.”

Question:

How can you find all of the contacts who don’t have a value in a particular property?

Solution:

  • Add a filter for that property and set it to “Is Unknown.”
  • Add a filter for that property and leave it blank.
  • Don’t add a filter for that property.
  • Add a filter for that property and enter “NULL” (in all capitals).