sql query to fetch top 3 salaries
<pre><code>  emp_name |salary
  ---------------
  A        |12568
  B        |3000
  C        |7852
  D        |2568
  E        |9852
  F        |1598
  G        |8569
</code></pre>

<p>I want a sql query to fetch the lowest 3 salaried employees</p>