Update SQL with consecutive numbering

Question

I want to update a table with consecutive numbering starting with 1. The update has a where clause so only results that meet the clause will be renumbered. Can I accomplish

Answer 1

UPDATE TableName
SET TableName.id = TableName.New_Id
FROM (
  SELECT id, ROW_NUMBER() OVER (ORDER BY id) AS New_Id
  FROM TableName
  ) TableName