Insert sequential number in MySQL

Question

I added an empty column to a table and now I want to insert sequential numbers to its rows. Is it possible to do it using SQL?

Answer 1

As I said in comments you can update every row with it's row number,

Here is a link to how to calculate rownum it mysql.

To rephrase:

update player,
       (select @rownum:=@rownum+1 ‘rank’, p.* 
        from player p,
        (SELECT @rownum:=0) r 
        order by score desc) player1
 set thatColumn= rank
 where player.id = player1.id