title: how to find people with same family name?
body: <p>You have a table with 4 columns:</p>
  
  <p>Primary key / name / surname / middle name</p>
  
  <p>How to write Sql query to find people who has same family name?</p>
  
  <p>1 /  Ivan / Ivanov / Ivanovich</p>
  
  <p>2 / Petr / Levinsky / Aleksandrovich</p>
  
  <p>3 / Alex / Ivanov / albertovich</p>
  
  <p>Should return Ivan and Alex</p>
  
  <p>Thanks</p>