mysql - 关于使用多个 SQL GROUP BY 语句的问题

Question

所以最终我试图显示一个投手在我的棒球联盟中赢得 Cy Young 奖的总次数，然后是他们赢得它的赛季年份，但按联盟名称排序，因为投手本可以在同一年的不同联赛中获奖。

这就是我尝试显示数据的方式:Andrew Jones (4) - 2021、2020 (18+)； 2021 年(28 岁以上)； 2021 (38+)，因此我需要 Seasons 列吐出这样的数据:2021, 2020 (18+); 2021 年(28 岁以上)； 2021 年(38 岁以上)

我有 3 个 mySQL 表(SEASON、LEAGUES、CY_YOUNG):

联赛

| LEAGUE_ID | LEAGUE_NAME   |
| -------- | -------------- |
| 1        | 18+            |
| 2        | 28+            |
| 3        | 38+            |
| 4        | 48+            |

季节

| SEASON_ID| LEAGUE_ID      | SEASON_YEAR |
| --------   | -------------| ----------- |
| 332        | 1            |   2021    |
| 333        | 2            |   2021    |
| 334        | 3            |   2021    |
| 335        | 4            |   2021    |
| 300        | 1            |   2020    |
| 301        | 2            |   2020    |
| 302        | 3            |   2020    |
| 303        | 4            |   2020    |

CY_YOUNG

| SEASON_ID  | PLAYER_NAME    | PLACE     |
| --------   | -------------- | ----------|
| 332        | Andrew Jones   |   1       |
| 332        | Mike Smith     |   2       |
| 333        | Andrew Jones   |   1       |
| 333        | Jacob Grimes   |   2       |
| 334        | Andrew Jones   |   1       |
| 334        | Travis Deane   |   2       |
| 300        | Andrew Jones   |   1       |

这是我当前的 SQL 查询:

   SELECT PLAYER_NAME, COUNT(ID) AS TotalWins, GROUP_CONCAT(DISTINCT CONCAT(S.SEASON_YEAR,' (',L.LEAGUE_NAME) 
   ORDER BY S.SEASON_YEAR DESC SEPARATOR '), ') AS Seasons
   FROM CY_YOUNG
   JOIN SEASONS S ON S.SEASON_ID = CY_YOUNG.SeasonID
   JOIN LEAGUES L ON L.LEAGUE_ID = S.LEAGUE_ID
   WHERE CY_YOUNG.Place = 1
   GROUP BY PLAYER_NAME
   HAVING TotalWins > 1
   ORDER BY TotalWins DESC;  

Seasons 列目前显示如下:2021 (18+)、2020 (18+)、2021 (38+) 但我希望它显示像这样:2021 年、2020 年(18 岁以上)； 2021 年(28 岁以上)； 2021 年(38 岁以上)。我知道我很接近所以任何帮助都将不胜感激!

Answer 1

您需要 2 个聚合级别:

SELECT PLAYER_NAME, 
       SUM(counter) AS TotalWins,  
       GROUP_CONCAT(years, ' (', LEAGUE_NAME, ')' ORDER BY LEAGUE_NAME, years) AS Seasons
FROM (
  SELECT PLAYER_NAME, L.LEAGUE_NAME,
         COUNT(*) counter,
         GROUP_CONCAT(S.SEASON_YEAR ORDER BY S.SEASON_YEAR DESC) AS years
  FROM CY_YOUNG C
  JOIN SEASONS S ON S.SEASON_ID = C.SEASON_ID
  JOIN LEAGUES L ON L.LEAGUE_ID = S.LEAGUE_ID
  WHERE C.Place = 1
  GROUP BY C.PLAYER_NAME, L.LEAGUE_NAME
) t  
GROUP BY PLAYER_NAME
HAVING TotalWins > 1
ORDER BY TotalWins DESC; 

参见 demo .