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.
假设我有一个包含karma_up和karma_down的表。每当有人投票时，karma_up会增加，每次有人投票时，karma_down也会增加。我如何提取这些选择的行并按这些新值的总和对它们进行排序？ ORDER BY（karma_up - karma_down）似乎没有按照我想要的方式工作。我只想把具有最高业力的行放在最前面。
3 个解决方案
#1
19
Very simple
很简单
SELECT
ID, KARMA_UP, KARMA_DOWN, (KARMA_UP-KARMA_DOWN) AS USER_KARMA
FROM KARMA
ORDER BY USER_KARMA DESC
#2
6
SELECT *, karma_up - karma_down AS karma_total
FROM MyTable
ORDER BY karma_total DESC;
#3
0
Does this work? If not, could you include the results in your question? Ordering on an expression ought to work as expected.
这有用吗？如果没有，你可以在你的问题中包含结果吗？对表达式的排序应该按预期工作。
SELECT `post_id`, `karma_up`, `karma_down`, `karma_up` - `karma_down` AS `total`
ORDER BY `total` DESC
#1
19
Very simple
很简单
SELECT
ID, KARMA_UP, KARMA_DOWN, (KARMA_UP-KARMA_DOWN) AS USER_KARMA
FROM KARMA
ORDER BY USER_KARMA DESC
#2
6
SELECT *, karma_up - karma_down AS karma_total
FROM MyTable
ORDER BY karma_total DESC;
#3
0
Does this work? If not, could you include the results in your question? Ordering on an expression ought to work as expected.
这有用吗？如果没有，你可以在你的问题中包含结果吗？对表达式的排序应该按预期工作。
SELECT `post_id`, `karma_up`, `karma_down`, `karma_up` - `karma_down` AS `total`
ORDER BY `total` DESC