title: How to use distinct in third column
body: <p>I want to run the query</p>
  
  <pre><code>select first_name, last_name, distinct salary from employees
  </code></pre>
  
  <p>But it throws an error. While if I use this <code>select distinct salary, first_name, last_name from employees</code> it runs.</p>
  
  <p>I want o/p in the form of first column should be first_name then last_name then distinct salary.</p>