排序依據：兩列之間的差異

Question

我對sql查詢有疑問。 我在表用戶中有兩列：

本周貨幣總數和貨幣

現在，我想對結果進行排序。 Moneytotal和Moneythisweek之間的差異越大，排名越高。

通常我使用：

$lsel_rank = mysql_query("select * from users ORDER BY Moneytotal DESC");
$rank = mysql_fetch_array($lsel_rank);

但是現在我想做類似的事情：

lsel_rank = mysql_query("select * from users ORDER BY Difference between Moneytotal         
AND Moneythisweek DESC");

誰能幫我？

Answer 1

SELECT * FROM `users` ORDER BY Moneytotal - Moneythisweek DESC

Answer 2

只是簡單地使用這個

$lsel_rank = mysql_query("select *,'moneytotal - monethisweek' as difference from users ORDER BY difference DESC");

Answer 3

選項1 ：（按orderby進行計算）

SELECT * FROM `users` ORDER BY (Moneytotal - Moneythisweek) DESC;

選項2 ：（按順序使用編號索引並計算差值並在選擇查詢的結果集中可用

SELECT (Moneytotal - Moneythisweek) difference, a.*  FROM `users` a ORDER BY 1 DESC;