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I have a problem with a null value, have an if statement where a comparison: if over 90 that puts "certified" if less than you put "non-certified" but if my field is empty (that is a base Excel) to make without information. In what way I can represent that it is null or empty field.
I only know this way, '' but it is not taking into account as null, how could you do to show "No information"?