title: How to write the sql to findout which value is not in the table?
body: <p>I am having a table Student and i have a set of 20 names. </p>
  
  <p>by using his sql </p>
  
  <pre><code>select name from student st where st.name in (
   'abc', 'xyz', . . .
  )
  </code></pre>
  
  <p>i can find out all student names which are in table and in the set.<br>
  Now, how can i find out which out of these 20 names are not in Student table.</p>