title: Decode function inside a decode function in SQL
body: <p>What does the sql statement below print with explanation please:</p>
  
  <pre><code>SELECT DECODE (2, 2, DECODE(3, 7, 2, 4, 5, 6)) FROM DUAL
  </code></pre>
  
  <p>I understand the decode function alone but wanted to make sure of my answer of a decode inside a decode function</p>