Posted over 10 years ago. Visible to the public.
How to update a MySQL column with ascending numbers
Given the problem you have a new column postion and that column should be updated for all existing rows with ascending numbers. Furthermore these numbers should be generated by a special order. In order to achieve that you could do the following:
execute "SET @pos := 0;" update " UPDATE pages SET position = ( SELECT @pos := @pos + 1 ) ORDER BY updated_at DESC;"