MYSQL 数据库 SELECT 带最小计数

Question

我得到了一个数据集 table 它看起来像这样：

###################################
UID    |TID     |MID     |RESULT  |
1      |1       |1       |1       |
2      |1       |1       |2       |
3      |1       |1       |3       |
4      |2       |1       |4       |
5      |2       |1       |5       |
6      |2       |1       |6       |
1      |1       |2       |6       |
2      |1       |2       |5       |
3      |1       |2       |4       |
4      |2       |2       |3       |
5      |2       |2       |2       |
6      |2       |2       |1       |
1      |1       |3       |2       |
2      |1       |3       |4       |
3      |1       |3       |6       |
4      |2       |3       |5       |
5      |2       |3       |3       |
6      |2       |3       |1       |

我现在想要每行的最小数量，按 TID 和 MID 分组

如果我这样做：

SELECT UID, TID, MID, RESULT  
FROM matches 
WHERE matches.id = '$ID'  
ORDER BY TID, MID, RESULT

我以正确的方式订购了东西。像这样：

###################################
UID    |TID     |MID     |RESULT  |
1      |1       |1       |1       |
2      |1       |1       |2       |
3      |1       |1       |3       |

3      |1       |2       |4       |
2      |1       |2       |5       |
1      |1       |2       |6       |

1      |1       |3       |2       |
2      |1       |3       |4       |
3      |1       |3       |6       |

4      |2       |1       |4       |
5      |2       |1       |5       |
6      |2       |1       |6       |

6      |2       |2       |1       |
5      |2       |2       |2       |
4      |2       |2       |3       |

6      |2       |3       |1       |
5      |2       |3       |3       |
4      |2       |3       |5       |

我现在只想拥有每个块的第一行。统计每个块中每个 UID 的最佳频率。

我不知道如何在 php 中不做很多循环就得到它。如果我按 TID、MID 和 MIN(RESULT) 进行 GROUP BY TID，它会随机出现哪个 UID。

解决方案:

SELECT COUNT(*) AS AMOUNT, t1.UID AS UID, t1.TID AS TID, t1.MID AS MID, t1.RESULT AS result
  FROM
  (
    SELECT um.user_id AS UID, um.team_id AS TID, um.match_id AS MID, um.q_result AS RESULT
    FROM user_matches um JOIN league_matches lm
    WHERE um.match_id = lm.id
    AND lm.league_subseason_id = '135'
    ORDER BY TID, MID
  ) t1
  INNER JOIN
  (
    SELECT um.user_id AS UID, um.team_id AS TID, um.match_id AS MID, min(um.q_result) AS min_result
    FROM user_matches um JOIN league_matches lm
    WHERE um.match_id = lm.id
    AND lm.league_subseason_id = '135'
    GROUP BY TID, MID
  ) t2 ON t2.TID = t1.TID AND t2.MID = t1.MID AND t2.min_result = t1.result
 GROUP BY t1.UID ORDER BY AMOUNT DESC

Answer 1

您可以将子查询与按 TID 和 MID 的列结果组的最小值一起使用

  SELECT UID, TID, MID, RESULT  
  FROM matches  m 
  inner join (
    select TID, MID, min(result) min_result
    from matches 
    group by TID, MID 
  ) t on t.TID = m.TID and t.MID = m.MID and t.min_result = m.result

查看您的代码和示例，您在子选择中有一个错误 user_id，您没有分组依据而是排序依据，所以我认为您应该这样更改代码

SELECT COUNT(*) AS AMOUNT, t1.UID AS UID, t1.TID AS TID, t1.MID AS MID, t1.RESULT AS result
  FROM
  (
    SELECT um.user_id AS UID, um.team_id AS TID, um.match_id AS MID, um.q_result AS RESULT
    FROM user_matches um JOIN league_matches lm
    WHERE um.match_id = lm.id
    AND lm.league_subseason_id = '135'
    ORDER BY TID, MID
  ) t1
  INNER JOIN
  (
    SELECT um.user_id AS UID, um.team_id AS TID, um.match_id AS MID, min(um.q_result) AS min_result
    FROM user_matches um JOIN league_matches lm
    WHERE um.match_id = lm.id
    AND lm.league_subseason_id = '135'
    GROUP BY TID, MID
  ) t2 ON t2.TID = t1.TID AND t2.MID = t1.MID AND t2.min_result = t1.result
 GROUP BY t1.UID ORDER BY AMOUNT DESC

MYSQL 数据库 SELECT 带最小计数

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