通過維護變量順序的SQL順序

Question

我創建了一個按點排序的排名查詢，然後如果它按創建日期排序。問題是，當我使用日期來訂購繪圖時，它會變得混亂。

這是我有什麼第一：

SELECT 
    @rownum := @rownum + 1 AS rank, 
    sticker_id, 
    total_shared, 
    total_liked, 
    total_used, 
    total_shared+total_liked+total_used AS points, 
    stickers.date 
FROM( 
    SELECT 
     sticker_id, 
     SUM(if(event_id = 1, 4, 0)) AS total_shared, 
     SUM(if(event_id = 2, 2, 0)) AS total_liked, 
     SUM(if(event_id = 3, 6, 0)) AS total_used 
    FROM stickers_stats 
    WHERE timestamp LIKE '2015-09%' 
    GROUP BY sticker_id 
) AS ranks 
JOIN (SELECT @rownum := 0) r 
INNER JOIN stickers 
    ON ranks.sticker_id = stickers.id 
ORDER BY points DESC 

結果：

---

這是我得到了什麼之後：

SELECT 
    @rownum := @rownum + 1 AS rank, 
    sticker_id, 
    total_shared, 
    total_liked, 
    total_used, 
    total_shared+total_liked+total_used AS points, 
    stickers.date 
FROM( 
    SELECT 
     sticker_id, 
     SUM(if(event_id = 1, 4, 0)) AS total_shared, 
     SUM(if(event_id = 2, 2, 0)) AS total_liked, 
     SUM(if(event_id = 3, 6, 0)) AS total_used 
    FROM stickers_stats 
    WHERE timestamp LIKE '2015-09%' 
    GROUP BY sticker_id 
) AS ranks 
JOIN (SELECT @rownum := 0) r 
INNER JOIN stickers 
    ON ranks.sticker_id = stickers.id 
ORDER BY points DESC, stickers.date ASC 

結果：

我試過改變字段顯示方式和所有內容的順序，但我找不到解決方案。如何通過points和stickers.date訂購新的排名位置？

Answer 1

當你開始將變量與其他結構混合時，MySQL可能會感到困惑。我不知道有什麼祕訣查詢在邊緣，但使用子查詢應該有所幫助：

SELECT @rownum := @rownum + 1 AS rank, t.* 
FROM (SELECT sticker_id, total_shared, total_liked, total_used, 
      (total_shared + total_liked + total_used) AS points, 
      s.date 
     FROM (SELECT sticker_id, 
        SUM(if(event_id = 1, 4, 0)) AS total_shared, 
        SUM(if(event_id = 2, 2, 0)) AS total_liked, 
        SUM(if(event_id = 3, 6, 0)) AS total_used 
      FROM stickers_stats 
      WHERE timestamp >= '2015-09-01' and timestamp < '2015-10-01' 
      GROUP BY sticker_id 
     ) r JOIN 
      stickers s 
      ON r.sticker_id = s.id 
    ) t CROSS JOIN 
    (SELECT @rownum := 0) params 
ORDER BY points DESC, date ASC; 

另外：

• 不要使用LIKE日期/時間值。
• 始終使用ON子句與JOIN。如果你想要一個CROSS JOIN，請明確。

Answer 2

我傾向於強制子查詢中的順序。它仍然沒有確定的工作（MySQL有一些在命令語句中的查詢語句會被執行），但似乎更可靠。

在這種情況下，我會建議你做的加入到子查詢中的貼紙，以及： -

SELECT 
    @rownum := @rownum + 1 AS rank, 
    sticker_id, 
    total_shared, 
    total_liked, 
    total_used, 
    total_shared+total_liked+total_used AS points, 
    stickers_date 
FROM( 
    SELECT 
     sticker_id, 
     stickers.date AS stickers_date, 
     SUM(if(event_id = 1, 4, 0)) AS total_shared, 
     SUM(if(event_id = 2, 2, 0)) AS total_liked, 
     SUM(if(event_id = 3, 6, 0)) AS total_used 
    FROM stickers_stats 
    INNER JOIN stickers 
    ON stickers_stats.sticker_id = stickers.id 
    WHERE YEAR(timestamp) = 2015 
    AND MONTH(timestamp) = 9 
    GROUP BY sticker_id, stickers_date 
    ORDER BY points DESC, stickers_date ASC 
) AS ranks 
CROSS JOIN (SELECT @rownum := 0) r 
ORDER BY points DESC, stickers.date ASC