title: how can i group by field value?
body: <p>how can i group by one field start by value 0
      eg.</p>
  
  <pre><code>select * from t;
  id, check_id, user_name
  1,  0,        user_a
  2,  1,        user_a
  3,  2,        user_a
  1,  0,        user_a
  2,  1,        user_a
  3,  3,        user_a
  1,  0,        user_b
  2,  1,        user_b
  3,  3,        user_b
  </code></pre>
  
  <p>group by check_id by start by value 0 per group </p>
  
  <pre><code>user_name, check_info
  user_a,    0-1-2
  user_a,    0-1-3
  user_b,    0-1-3
  </code></pre>
  
  <p>how can i group by?</p>