title: How to clear stored substitution variables in Oracle SQL developer
body: <p>Suppose I have a query:</p>
  
  <pre><code>SELECT * from table1 tr where tr.start_time &lt; &amp;&amp;starttime;
  </code></pre>
  
  <p>First time i execute the query, SQL Developer prompts me to enter the value for the substitution variable 'starttime' and is stored. Next time I run the script, it reuses the same value again, how do I reset/clear the stored value?</p>