title: SQL: is there a query that returns records only when there is an increment of +1 in a field?
body: <p><a href="https://i.stack.imgur.com/jdMvT.jpg" rel="nofollow noreferrer">sample_table</a></p>
  <p>Hello. I am looking for a query that will only return the case where there was any increase in the 'numoflaptop' field. I would like to identify the family that has acquired any additional laptop.</p>
  <p>The end result should have only 2 records
  'family1, purchase, 3' and 'family4, purchase, 3'</p>
  <p>family2 is not included in the result since it was a decrease of 1 and family3 is not included since there was no change in numoflaptop field.</p>
  <p>Thanks in advance.</p>
  <p>I am using Teradata</p>