title: Show only one record, if value same in another column SQL
body: <p>I have a table with 5 columns like this: </p>
  
  <pre>
   | ID | NAME  | PO_NUMBER  | DATE       | STATS |
   | 1  | Jhon  | 160101-001 | 2016-01-01 | 7     |
   | 2  | Jhon  | 160101-002 | 2016-01-01 | 7     |
   | 3  | Jhon  | 160102-001 | 2016-01-02 | 7     |
   | 4  | Jane  | 160101-001 | 2016-01-01 | 7     |
   | 5  | Jane  | 160102-001 | 2016-01-02 | 7     |
   | 6  | Jane  | 160102-002 | 2016-01-02 | 7     |
   | 7  | Jane  | 160102-003 | 2016-01-02 | 7     |
  </pre>
  
  <p>I need to display all values, but <code>stats</code> fields without duplicate according from <code>date</code> field.<br>
  Like this</p>
  
  <pre>
   | ID | NAME  | PO_NUMBER  | DATE       | STATS |
   | 1  | Jhon  | 160101-001 | 2016-01-01 | 7     |
   | 2  | Jhon  | 160101-002 | 2016-01-01 | null  |
   | 3  | Jhon  | 160102-001 | 2016-01-02 | 7     |
   | 4  | Jane  | 160101-001 | 2016-01-01 | 7     |
   | 5  | Jane  | 160102-001 | 2016-01-02 | 7     |
   | 6  | Jane  | 160102-002 | 2016-01-02 | null  |
   | 7  | Jane  | 160102-003 | 2016-01-02 | null  |
  </pre>
  
  <p>I've had trouble getting the hoped. Thanks</p>