How to close sequence gaps in SQL Server?

Question

Let\'s say I have a Turtle table. When I run

SELECT * FROM Turtle ORDER BY Sort

I get this:

Id | Name | Sort
2    Leo    1
3           


        

Answer 1

You can do the update just using a CTE with the row_number(), and then just update the CTE:

;with CTE as (
  select *, row_number () over (order by Sort) as RN
  from Turtle
)

update CTE
set Sort = RN