Syntax for calculated field with null value
How can I write a formula that evaluates whether the value in a field is null? Thank you for suggestions!
I am trying to combine the values in text fields into a new text field for an envelope label. For example, if Joe and Mary have the same last name, I want the result in the envelope label text field to be "Joe and Mary Smith." If the two last names are different I want the result to be "Joe Smith and Mary Jackson." If Joe doesn't have a partner at all, I just want the result in the envelope label to read "Joe Smith."
I am having trouble figuring out how to get Filemaker pro to evaluate if the Partner Last Name field is not null so I don't end up withthe result "Joe Smith and"
If ( Name_Last = PartnerLName and PartnerLName IS NOT NULL; Name_First & "and " &PartnerFName& " " & Name_Last ; Name_First & " " & Name_Last& " " & "and " & PartnerFName & " " & PartnerLName)
Can anyone help me with the syntax for "IS NOT NULL" in the formula above?