Question

ID    Vote_Up    Vote_Down    ***DIFFERENCE***
1         3            1             2
2         1            3            -2
3         23           7             16
4         5            1             4
5         7            5             2
6         2            2             0
7         9            1             8    

How do i sort the data above in mysql based on the difference of Vote_Up and Vote_Down Without having to create another column to store their difference?

vote_up - vote_down

So that it will be sorted this way:

ID    Vote_Up    Vote_Down    ***DIFFERENCE***
3         23           7             16
7         9            1             8    
4         5            1             4
5         7            5             2
1         3            1             2
6         2            2             0
2         1            3            -2

Answer 1

@Konerak:
DIFFERENCE is not a field.
Use this SQL query:

SELECT * FROM table ORDER BY Vote_Up - Vote_Down DESC;

or

SELECT *, Vote_Up - Vote_Down as DIFFERENCE FROM table ORDER BY DIFFERENCE DESC;