title: How to select SQL rows where a spesific column is not the same value as another row?
body: <p>I have a table with some columns, one of these are "email".
  I want to select the rows in this table, where there is no duplicate value in "email".</p>
  
  <p>Meaning if the table was like this:</p>
  
  <pre><code>id - email
  10 - hello@hello.com
  11 - bro@lift.com
  12 - hello@hello.com
  13 - hey@hello.com
  </code></pre>
  
  <p>The query would return only id 11 and 13, as 10 and 12 are duplicates.</p>