mySQL return not empty field -

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I have two fields, but I just want to return empty-empty one. 

  First name, choose last name, (if firstname! = Empty, then first name and last name) names from users;

How can I go about doing something like the above? I'm not sure what should be inside the round bracket. I do not want to use PHP post processing.

Both the null values ​​along with the empty string ( '' ) 

  Select IF (LENGTH (first name), first name, last name) as the name from users;

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