title: Oracle sql: Convert column to row
body: <p>I have select statement like this.</p>
  
  <pre><code>select 'A','B','C' from dual;
  </code></pre>
  
  <p>It display</p>
  
  <pre><code>'A' 'B' 'C'
   A   B   C
  </code></pre>
  
  <p>I want it show like this</p>
  
  <pre><code>'A'
  
   A
  
   B
  
   C
  </code></pre>
  
  <p>Please help me.</p>