title: How to group by table with null values together
body: <p>I have table with rows:</p>
  
  <pre><code>Id, Name, Age, Field1, Field2
  -----------------------------
  1, 'Person_1', 23, NULL, 5
  2, 'Person_1', 23, 3, NULL
  3, 'Person_2, 25, 7, NULL
  </code></pre>
  
  <p>I want to group it to have result like this:</p>
  
  <pre><code>'Person_1', 23, 3, 5
  'Person_2, 25, 7, NULL
  </code></pre>
  
  <p>I tried to do subquery and select Field1 and Field2 but it always gets first row of single person for field1 and field2</p>