sql - @curRow基於列

Question

我創建了排名系統，因此我需要爲每個用戶設置排名位置。
我這樣做：

SELECT @curRow := @curRow + 1 AS position, 
       Sum(point_user.amount) AS points 
FROM  users u 
JOIN  point_user ON u.id = point_user.user_id 
JOIN (SELECT @curRow := 0) r 
GROUP BY 
u.id 
ORDER BY 
position ASC 

而且我越來越：

+----------+----------+ 
| position | points | 
+----------+----------+ 
|  1 | 86  | 
|  2 | 239  | 
|  3 | 45  | 
+----------+----------+ 

現在，我怎麼可以設置行號的基礎上，分？
是否應是這樣的：

+----------+----------+ 
| position | points | 
+----------+----------+ 
|  1 | 239  | 
|  2 | 86  | 
|  3 | 45  | 
+----------+----------+ 

UPDATE

SELECT (@curRow := @curRow + 1) as position, 
       points, 
       u2.id 
FROM (SELECT Sum(pu.amount) AS points 
     FROM users u JOIN 
      point_user pu 
      ON u.id = pu.user_id 
     GROUP BY u.id 
     ORDER BY points DESC 
) upu, users u2 
CROSS JOIN (
      SELECT @curRow := 0 
) params 
ORDER BY points DESC 

Answer 1

在查詢中，它可能是足以改變ORDER BY到ORDER BY points DESC - 因爲這似乎是你的意圖。

但是，MySQL有一個已知的變量和GROUP BY問題。解決方案只是使用子查詢：

SELECT (@curRow := @curRow + 1) as position, points 
FROM (SELECT Sum(pu.amount) AS points 
     FROM users u JOIN 
      point_user pu 
      ON u.id = pu.user_id 
     GROUP BY u.id 
     ORDER BY points DESC 
    ) upu CROSS JOIN 
    (SELECT @curRow := 0) params 
ORDER BY points DESC;