title: SQL NOT IN Function
body: <p>Iam trying to insert a record and i want to check that it is not already present in the table.</p>
  
  <p>I try</p>
  
  <pre><code>INSERT INTO emp (empno, name) 
  VALUES(2, 'ram') 
  WHERE empno NOT IN (select empno from emp);
  </code></pre>
  
  <p>but it shows error '<code>incorrect syntax near where</code>'</p>