title: MySQL GROUP BY Multiple Columns
body: <p>I need to perform a GROUP BY on 2 columns separately...</p>
  
  <p>In common terms, I'd like the query to say: GROUP BY column 1, then once this grouping has been performed, and the rows returned have been refined, go back to the top and GROUP BY column 2 to refine the rows returned again. </p>
  
  <p>For instance, instead of stating:
  GROUP BY column_1, column_2</p>
  
  <p>I want to state (I Understand this is incorrect syntax):
  GROUP BY column_1
  GROUP BY column_2</p>
  
  <p>If this is unclear I can include a sample query with expected returned results.</p>