title: Postgresql split column into rows
body: <p>I have 2 columns with a list of towns and I want to split the towns into rows</p>
  
  <pre><code>user 1 | [town1,town2,town3]
  </code></pre>
  
  <p>I want to split this into rows:</p>
  
  <pre><code>user 1 | town 1
  user 1 | town 2
  user 1 | town 3
  </code></pre>