title: How to remove duplicates from table using SQL query
body: <p>I have a table which is as follows:</p>
  
  <pre><code>emp_name   emp_address  sex  matial_status  
  uuuu       eee          m    s
  iiii       iii          f    s
  uuuu       eee          m    s
  </code></pre>
  
  <p>I want to remove the duplicate entries based on 3 fields emp_name, emp_address and sex.
  and my resultant table (after removing the duplicates) should look like -</p>
  
  <pre><code>emp_name    emp_address   sex   marital_status
  uuuu        eee           m     s
  iiii        iii           f     s
  </code></pre>
  
  <p>I am not able to recall how to write a SQL Query for this. an anyone pls help?</p>