title: Group different rows in one by combining strings
body: <p>I have a data set like this:</p>
  <pre><code>Column1  Column2
     1       A
     1       B
     1       C
     2       D
     2       E
     2       F
     2       G
     3       H
     3       I 
  </code></pre>
  <p>and  I would like to merge it into something like this:</p>
  <pre><code>Column1  Column2
     1       A, B, C
     2       D, E, F, G
     3       H, I
  </code></pre>
  <p>Is it possible to do this in SQLite somehow? I though of GROUP BY Column1, but I don't see how I can combine the Column2 data in one string...</p>
  <p>Thanks!</p>