title: Rails, execute sql returns an array of hash
body: <p>I have following:</p>
  
  <pre><code>recs = conn.execute sql
  </code></pre>
  
  <p>output:</p>
  
  <pre><code>[{"mk1"=&gt;"test007", 0=&gt;"test007"}, {"mk1"=&gt;"test009", 0=&gt;"test009"}, {"mk1"=&gt;"test0010", 0=&gt;"test0010"}, {"mk1"=&gt;"test00112", 0=&gt;"test00112"}, {"mk1"=&gt;"test345", 0=&gt;"test345"}, {"mk1"=&gt;"testprüfer", 0=&gt;"testprüfer"}, {"mk1"=&gt;"test3455", 0=&gt;"test3455"}, {"mk1"=&gt;"aaaa", 0=&gt;"aaaa"}, {"mk1"=&gt;"pat1", 0=&gt;"pat1"}, {"mk1"=&gt;"pat222", 0=&gt;"pat222"}, {"mk1"=&gt;"poook_patient", 0=&gt;"poook_patient"}, {"mk1"=&gt;"sylviaparient", 0=&gt;"sylviaparient"}, {"mk1"=&gt;"patient_of_sylvia", 0=&gt;"patient_of_sylvia"}, {"mk1"=&gt;"test0005", 0=&gt;"test0005"}, {"mk1"=&gt;"test0006", 0=&gt;"test0006"}]
  </code></pre>
  
  <p>Is there a fast way to get only the values of "mk1"'s by using maybe not "execute" but something else?
  I would like to be faster then this one if it is possible: </p>
  
  <pre><code>mk1s = []
  recs.each{|l| mks1s.push(l["mk1"]) }
  </code></pre>
  
  <p>Thank you in advance.</p>