title: Execute Query string in postgreSQL
body: <p>I have a query string in variable</p>
  
  <p>suppose <code>Select Now()</code>;
  I want to execute it same like SQL do.
  I use</p>
  
  <pre><code>Execute 'Select Now()';
  </code></pre>
  
  <p>But It throws an exception</p>
  
  <blockquote>
    <p>prepared statement "SELECT now()" does not exist</p>
  </blockquote>
  
  <p>and not allow me to execute it.</p>
  
  <p>Is there any way to do that?</p>