title: python dataframe to_sql with different schema
body: <p>I want to store a dataframe into an existing MSSQL table.
  Dataframe has 3 columns, but the SQL table has only 2.</p>
  
  <p>How is it possible to store the 2 columns with the same name into SQL?</p>
  
  <p>I tried the following code:</p>
  
  <pre><code>df.to_sql(sTable, engine, if_exists='append')
  </code></pre>
  
  <p>It works, if the number and names of the columns are exactly the same. But I want to make my code more generic.</p>