mysql update a column with an int based on order

Question

Lets say I have these columns

 uniqueID|Money|Quantity|MoneyOrder|QuantityOrder
1|23|12||
2|11|9||
3|99|100||

What I want to do is update <

Answer 1

See answers to this question:

Updating column so that it contains the row position

SET @counter = 0;

UPDATE 
my_table
SET MoneyOrder = @counter := @counter + 1
ORDER BY Money;

SET @counter = 0;

UPDATE 
my_table
SET QuantityOrder = @counter := @counter + 1
ORDER BY Quantity;

Answer 2

SET @rownumber = 0;    
update mytable set Moneyorder = (@rownumber:=@rownumber+1)
order by MoneyOrder asc

or to do it in a single query you can try

update mytable target
join
(
     select id, (@rownumber := @rownumber + 1) as rownum
     from mytable         
     cross join (select @rownumber := 0) r
     order by MoneyOrder asc
) source on target.id = source.id    
set Moneyorder = rownum