SELECT only latest record of an ID from given rows

Question

I have this table shown below...How do I select only the latest data of the id based on changeno?

+----+--------------+------------+--------+
| id |  data   | ch         


        

Answer 1

You want to use row_number() for this:

select id, data, changeno
from (SELECT t.*,
             row_number() over (partition by id order by changeno desc) as seqnum
      FROM Table1 t
     ) t
where seqnum = 1;