Order By Sum of Two Fields

Question

Let's say I have a table with karma_up and karma_down. Everytime someone votes up karma_up gets incremented and everytime someone votes down karma_down gets incremented one as well. How can I pull these a selection of rows and have them ordered by the sum of these new values? ORDER BY (karma_up - karma_down) does not seem to work how I want. I simply want the rows with the highest karma up top.

Answer 1

not quite what you want but:

Order By karma_up ASC Order By karma_down DESC

Answer 2

Very simple

SELECT 
ID, KARMA_UP, KARMA_DOWN, (KARMA_UP-KARMA_DOWN) AS USER_KARMA 
FROM KARMA 
ORDER BY USER_KARMA DESC

Answer 3

Does this work? If not, could you include the results in your question? Ordering on an expression ought to work as expected.

SELECT `post_id`, `karma_up`, `karma_down`, `karma_up` - `karma_down` AS `total`
ORDER BY `total` DESC

Answer 4

SELECT *, karma_up - karma_down AS karma_total 
FROM MyTable
ORDER BY karma_total DESC;