title: Select rows with column with min value
body: <p>I need to select the rows with the minimum distance by grouping on the OrganisationID. Here is my data in a single table:</p>
  
  <pre><code>ID  OrganisationID    Distance
  0        10             100
  1        10             200
  3        10             50
  4        20             80
  5        20             300
  </code></pre>
  
  <p>This is the result I want:</p>
  
  <pre><code>ID  OrganisationID    Distance
  3        10             50
  4        20             80
  </code></pre>