title: to_number function in sql
body: <p>i could not understand why following code
  SQL> </p>
  
  <pre><code>Select to_number('1234.64', '9999.9') from Dual;
  </code></pre>
  
  <p>returns  this number    1234.6?is it  something like rounding  ,truncation or?please help me to  understand this code,i know to_number  functions,i have used many times this code for simple chars,but here it is  not clear  anything</p>