Sharepoint 2013 List validation - two fields contain text

Question

Pardon this newbie question on SharePoint list validation, I have been researching this for days

1. SharePoint 2013

2. SharePoint LIST validation since you cannot compare two fields in FIELD validation

3. Two fields in same list:

field#1 -- Employee's Email Address

field#2 -- Vendor Contact Name

4. Validation - If both fields contain data then don't allow the form to save. Basically if either field is blank allow the form to save.

Answer 1

Try Using below formula :

=IF(OR(ISBLANK([Column1]), ISBLANK([Column2])), true, false)