Is there a form abandonment tutorial?

Hi all,

We’re looking to do some work on form abandonment with our Snowplow data in Redshift. We are quite clear on the concept for this - where there are change form events, but no corresponding submit form events, grouped by domain user ID or User ID.

However, physically writing the SQL for this is proving difficult. Is there an existing tutorial for measuring form abandonment? If not, I would really like to see one!