title: How to update only one row in table but with id number
body: <p>I have this table:</p>
  <p><img src="https://i.stack.imgur.com/rWOXS.png" alt="Table screenshot" /></p>
  <p>How to join row 2 to row 1 (id = 24, count = 2) and row 5 to row 4 (id = 27, count = 3)</p>