根据累计运行总数分配标志

Question

我有一个 table，如上所示，它来自以下查询：

SELECT f_id, f_datetime, (f_player1_score+f_player2_score) AS legs,
            SUM(f_player1_score+f_player2_score) OVER (ORDER BY f_datetime DESC) AS total_legs,
            IF(DATE(f_datetime) = DATE(NOW()), 1, 0) AS f_status
            FROM results

我希望我创建的 f_status 查询列具有以下规则：

1 - If `DATE(f_datetime) = DATE(NOW())` THEN assign `f_status=1`, which is what I've done.
2 - take the maximum total legs where `f_status=1` (i.e. 4 and add 50), then assign `f_status=2` up to total_legs=54,
3) Anything after 2) assign as 3

下面的期望输出：

我知道怎么做，但它需要很多 table 别名，而且真的很乱。有简单的方法吗？

谢谢

Answer 1

如果我没看错的话，你可以添加一个 CASE 表达式和你想要的布尔逻辑：

SELECT f_id, f_datetime,
      (f_player1_score+f_player2_score) AS legs,
      SUM(f_player1_score+f_player2_score) OVER (ORDER BY f_datetime DESC) AS total_legs,
       (CASE WHEN DATE(f_datetime) = CURDATE())
             THEN 1
             WHEN SUM(f_player1_score+f_player2_score) OVER (ORDER BY f_datetime DESC) <= 54
             THEN 2
             ELSE 3
        END) AS f_status
FROM results ;

编辑：

如果54只是50加上当天，你可以使用：

SELECT f_id, f_datetime,
      (f_player1_score+f_player2_score) AS legs,
      SUM(f_player1_score + f_player2_score) OVER (ORDER BY f_datetime DESC) AS total_legs,
       (CASE WHEN DATE(f_datetime) = CURDATE()
             THEN 1
             WHEN SUM(f_player1_score + f_player2_score) OVER (ORDER BY f_datetime) <=
                  50 + SUM(CASE WHEN DATE(f_datetime) = CURDATE() THEN f_player1_score + f_player2_score ELSE 0 END)
             THEN 2
             ELSE 3
        END) AS f_status
FROM results ;

Answer 2

感谢使用 CASE 表达式的建议...

SELECT X.*,
    (CASE WHEN DATE(f_datetime) = CURDATE() then 1 
                WHEN total_legs<= MAX(CASE WHEN DATE(f_datetime) = CURDATE() THEN total_legs + 50 END) OVER(ORDER BY f_datetime DESC) then 2 
                ELSE 3 END) AS f_status
        
 FROM
(
    SELECT f_id, f_datetime, (f_player1_score+f_player2_score) AS legs,
                SUM(f_player1_score+f_player2_score) OVER (ORDER BY f_datetime DESC) AS total_legs
                
                FROM results 
) X

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根据累计 运行 总数分配标志

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根据累计运行总数分配标志