title: Oracle: Combine Two Tables with Different Columns
body: <p>This is table 1:</p>
  
  <pre><code>col_1  col_2  date_1
  -----  -----  ------
  1      3      2016
  2      4      2015
  </code></pre>
  
  <p>And this is table 2:</p>
  
  <pre><code>col_3  col_4  date_2
  -----  -----  ------
  5      8      2014
  6      9      2012
  </code></pre>
  
  <p>I want a result like this:</p>
  
  <pre><code>col_1  col_2  col_3  col_4  date_1  date_2
  -----  -----  -----  -----  ------  ------
  1      3      NULL   NULL   2016    NULL
  2      4      NULL   NULL   2015    NULL
  NULL   NULL   5      8      NULL    2014
  NULL   NULL   6      9      NULL    2012
  </code></pre>
  
  <p>Any solutions?</p>