Question

I have this code from this link: How can I remove duplicate rows?

 ;WITH cte
 AS (SELECT ROW_NUMBER() OVER (PARTITION BY person_id, date_work, hours
                                   ORDER BY ( SELECT 0)) RN
     FROM   work_hours)
 DELETE FROM cte
 WHERE  RN > 1

Is it possible to remove first entered row of duplicate or i should have an extra column date_of_entry? I want to do this if i entered same date_work and different hours PARTITION BY person_id, date_work it remove randomly duplicates.

If it isn’t possible, how can i remove duplicates with higher hours?

Answer 1

Add order by hours desc

;WITH cte
 AS (SELECT ROW_NUMBER() OVER (PARTITION BY person_id, date_work
                                   ORDER BY hours DESC) RN
     FROM   work_hours)
 DELETE FROM cte
 WHERE  RN > 1