我有一个数据集，其中包含每个灯具的团队排名。我想为每个灯具计算该等级的移动平均值。不同球员和固定装置的数量不是固定的，因此我需要能够计算每行的平均值，然后重置平均值以考虑适用于与最后一行不同的球员的排名值。 我在aws上运行mysql
我已经能够计算整个组合的移动平均值-只是不确定如何由玩家重置平均值
SELECT
date,
playerName,
fixtureRank,
teamName,
overallRank,
vsTeamname,
@overallRank:=@overallRank + overallRank totalRank,
@RowNumber:=@RowNumber + 1 rowNumber
FROM
evenmorePlayerData
JOIN (SELECT @overallRank:=0) t
JOIN (SELECT @RowNumber:=0) s
evenmorePlayerData的示例：
+---------------------+-------------+--------------+---------------+-------------+--------------------+
| date | playerName | fixtureRtank | teamName | OverallRank | vsTeamName |
+---------------------+-------------+--------------+---------------+-------------+--------------------+
| 2018-09-05 00:00:00 | A Hodgson | 1 | Mellor C | 19 | Cheadle Hulme A |
| 2018-09-17 00:00:00 | A Hodgson | 1 | Mellor C | 19 | Bramhall Village B |
| 2018-09-27 00:00:00 | A Hodgson | 1 | Mellor C | 19 | Manor C |
| 2018-10-04 00:00:00 | A Hodgson | 1 | Mellor C | 19 | Disley D |
| 2018-10-16 00:00:00 | A Hodgson | 8 | Mellor B | 17 | Mellor C |
| 2018-11-01 00:00:00 | A Hodgson | 9 | Mellor B | 18 | Disley D |
| 2018-11-06 00:00:00 | A Hodgson | 1 | Mellor C | 19 | Mellor B |
| 2018-11-08 00:00:00 | A Hodgson | 1 | Mellor C | 19 | College Green D |
| 2018-12-06 00:00:00 | A Hodgson | 1 | Mellor C | 19 | Poynton A |
| 2018-12-13 00:00:00 | A Hodgson | 9 | Mellor B | 18 | Manor C |
| 2019-01-17 00:00:00 | A Hodgson | 1 | Mellor C | 19 | Disley D |
| 2019-01-24 00:00:00 | A Hodgson | 1 | Mellor C | 19 | Disley C |
| 2018-09-04 00:00:00 | Adam Wilman | 1 | GHAP A | 1 | Canute A |
| 2018-09-25 00:00:00 | Adam Wilman | 1 | GHAP A | 1 | Parrswood A |
| 2018-09-27 00:00:00 | Adam Wilman | 1 | GHAP A | 1 | Astrazeneca B |
| 2018-11-06 00:00:00 | Adam Wilman | 1 | GHAP A | 1 | Parrswood A |
| 2019-01-22 00:00:00 | Adam Wilman | 1 | GHAP A | 1 | Disley A |
| 2019-01-25 00:00:00 | Adam Wilman | 1 | GHAP A | 1 | Altrincham Central |
| 2019-02-05 00:00:00 | Adam Wilman | 1 | GHAP A | 1 | Bramhall Village A |
| 2018-09-11 00:00:00 | Ade Hancox | 2 | Astrazeneca A | 2 | Racketeers A |
| 2018-09-17 00:00:00 | Ade Hancox | 1 | Astrazeneca A | 1 | Racketeers A |
| 2018-09-25 00:00:00 | Ade Hancox | 1 | Astrazeneca A | 1 | Racketeers B |
| 2018-09-30 00:00:00 | Ade Hancox | 1 | Astrazeneca A | 1 | Syddal Park B |
| 2018-10-09 00:00:00 | Ade Hancox | 5 | Astrazeneca A | 5 | Carrington A |
| 2018-10-16 00:00:00 | Ade Hancox | 1 | Astrazeneca A | 1 | College Green A |
| 2018-10-23 00:00:00 | Ade Hancox | 5 | Astrazeneca A | 5 | Syddal Park A |
+---------------------+-------------+--------------+---------------+-------------+--------------------+
当前查询结果（样本）：
+---------------------+-------------+---------------+---------------+--------------+--------------------+-----------+------------+
| date | playerName | fixtureRtank | teamName | overallRank | vsTeamName | totalRank | rowNumber |
+---------------------+-------------+---------------+---------------+--------------+--------------------+-----------+------------+
| 2018-09-05 00:00:00 | A Hodgson | 1 | Mellor C | 19 | Cheadle Hulme A | 19 | 1 |
| 2018-09-17 00:00:00 | A Hodgson | 1 | Mellor C | 19 | Bramhall Village B | 38 | 2 |
| 2018-09-27 00:00:00 | A Hodgson | 1 | Mellor C | 19 | Manor C | 57 | 3 |
| 2018-10-04 00:00:00 | A Hodgson | 1 | Mellor C | 19 | Disley D | 76 | 4 |
| 2018-10-16 00:00:00 | A Hodgson | 8 | Mellor B | 17 | Mellor C | 93 | 5 |
| 2018-11-01 00:00:00 | A Hodgson | 9 | Mellor B | 18 | Disley D | 111 | 6 |
| 2018-11-06 00:00:00 | A Hodgson | 1 | Mellor C | 19 | Mellor B | 130 | 7 |
| 2018-11-08 00:00:00 | A Hodgson | 1 | Mellor C | 19 | College Green D | 149 | 8 |
| 2018-12-06 00:00:00 | A Hodgson | 1 | Mellor C | 19 | Poynton A | 168 | 9 |
| 2018-12-13 00:00:00 | A Hodgson | 9 | Mellor B | 18 | Manor C | 186 | 10 |
| 2019-01-17 00:00:00 | A Hodgson | 1 | Mellor C | 19 | Disley D | 205 | 11 |
| 2019-01-24 00:00:00 | A Hodgson | 1 | Mellor C | 19 | Disley C | 224 | 12 |
| 2018-09-04 00:00:00 | Adam Wilman | 1 | GHAP A | 1 | Canute A | 225 | 13 |
| 2018-09-25 00:00:00 | Adam Wilman | 1 | GHAP A | 1 | Parrswood A | 226 | 14 |
| 2018-09-27 00:00:00 | Adam Wilman | 1 | GHAP A | 1 | Astrazeneca B | 227 | 15 |
| 2018-11-06 00:00:00 | Adam Wilman | 1 | GHAP A | 1 | Parrswood A | 228 | 16 |
| 2019-01-22 00:00:00 | Adam Wilman | 1 | GHAP A | 1 | Disley A | 229 | 17 |
| 2019-01-25 00:00:00 | Adam Wilman | 1 | GHAP A | 1 | Altrincham Central | 230 | 18 |
| 2019-02-05 00:00:00 | Adam Wilman | 1 | GHAP A | 1 | Bramhall Village A | 231 | 19 |
| 2018-09-11 00:00:00 | Ade Hancox | 2 | Astrazeneca A | 2 | Racketeers A | 233 | 20 |
| 2018-09-17 00:00:00 | Ade Hancox | 1 | Astrazeneca A | 1 | Racketeers A | 234 | 21 |
| 2018-09-25 00:00:00 | Ade Hancox | 1 | Astrazeneca A | 1 | Racketeers B | 235 | 22 |
| 2018-09-30 00:00:00 | Ade Hancox | 1 | Astrazeneca A | 1 | Syddal Park B | 236 | 23 |
| 2018-10-09 00:00:00 | Ade Hancox | 5 | Astrazeneca A | 5 | Carrington A | 241 | 24 |
| 2018-10-16 00:00:00 | Ade Hancox | 1 | Astrazeneca A | 1 | College Green A | 242 | 25 |
+---------------------+-------------+---------------+---------------+--------------+--------------------+-----------+------------+
您可以看到行总数一直在增加，我真的不知道从哪里开始实现我的目标。
答案 0 :(得分：0)
我可能已经弄清楚了...但是感觉很hacky，因此，如果有人有更好的解决方案，我仍然可以回答：
SELECT
date,
playerName,
fixtureRank,
teamName,
overallRank,
vsTeamname,
@currentName:= @currentName prevName,
case when @currentName NOT LIKE playerName
THEN
@overallRank:= overallRank
ELSE
@overallRank:=@overallRank + overallRank
END AS totalRank,
case when @currentName NOT LIKE playerName
THEN
@RowNumber:= 1
ELSE
@RowNumber:=@RowNumber + 1
END AS rowNumber,
@overallRank / @RowNumber as averageRank,
@currentName:= playerName currentName
FROM
evenmorePlayerData
JOIN
(SELECT @overallRank:=0) t
JOIN
(SELECT @RowNumber:=0) s
JOIN
(SELECT @currentName:="") r
似乎已经完成了。俩。
+---------------------+-------------+---------------+---------------+--------------+--------------------+-------------+-----------+------------+--------------------+--------------+
| date | playerName | fixtureRtank | teamName | overallRank | vsTeamName | prevName | totalRank | rowNumber | avgRank | currentName |
+---------------------+-------------+---------------+---------------+--------------+--------------------+-------------+-----------+------------+--------------------+--------------+
| 2018-09-05 00:00:00 | A Hodgson | 1 | Mellor C | 19 | Cheadle Hulme A | | 19 | 1 | 19 | A Hodgson |
| 2018-09-17 00:00:00 | A Hodgson | 1 | Mellor C | 19 | Bramhall Village B | A Hodgson | 38 | 2 | 19 | A Hodgson |
| 2018-09-27 00:00:00 | A Hodgson | 1 | Mellor C | 19 | Manor C | A Hodgson | 57 | 3 | 19 | A Hodgson |
| 2018-10-04 00:00:00 | A Hodgson | 1 | Mellor C | 19 | Disley D | A Hodgson | 76 | 4 | 19 | A Hodgson |
| 2018-10-16 00:00:00 | A Hodgson | 8 | Mellor B | 17 | Mellor C | A Hodgson | 93 | 5 | 18.6 | A Hodgson |
| 2018-11-01 00:00:00 | A Hodgson | 9 | Mellor B | 18 | Disley D | A Hodgson | 111 | 6 | 18.5 | A Hodgson |
| 2018-11-06 00:00:00 | A Hodgson | 1 | Mellor C | 19 | Mellor B | A Hodgson | 130 | 7 | 18.571428571428573 | A Hodgson |
| 2018-11-08 00:00:00 | A Hodgson | 1 | Mellor C | 19 | College Green D | A Hodgson | 149 | 8 | 18.625 | A Hodgson |
| 2018-12-06 00:00:00 | A Hodgson | 1 | Mellor C | 19 | Poynton A | A Hodgson | 168 | 9 | 18.666666666666668 | A Hodgson |
| 2018-12-13 00:00:00 | A Hodgson | 9 | Mellor B | 18 | Manor C | A Hodgson | 186 | 10 | 18.6 | A Hodgson |
| 2019-01-17 00:00:00 | A Hodgson | 1 | Mellor C | 19 | Disley D | A Hodgson | 205 | 11 | 18.636363636363637 | A Hodgson |
| 2019-01-24 00:00:00 | A Hodgson | 1 | Mellor C | 19 | Disley C | A Hodgson | 224 | 12 | 18.666666666666668 | A Hodgson |
| 2018-09-04 00:00:00 | Adam Wilman | 1 | GHAP A | 1 | Canute A | A Hodgson | 1 | 1 | 1 | Adam Wilman |
| 2018-09-25 00:00:00 | Adam Wilman | 1 | GHAP A | 1 | Parrswood A | Adam Wilman | 2 | 2 | 1 | Adam Wilman |
| 2018-09-27 00:00:00 | Adam Wilman | 1 | GHAP A | 1 | Astrazeneca B | Adam Wilman | 3 | 3 | 1 | Adam Wilman |
| 2018-11-06 00:00:00 | Adam Wilman | 1 | GHAP A | 1 | Parrswood A | Adam Wilman | 4 | 4 | 1 | Adam Wilman |
| 2019-01-22 00:00:00 | Adam Wilman | 1 | GHAP A | 1 | Disley A | Adam Wilman | 5 | 5 | 1 | Adam Wilman |
| 2019-01-25 00:00:00 | Adam Wilman | 1 | GHAP A | 1 | Altrincham Central | Adam Wilman | 6 | 6 | 1 | Adam Wilman |
| 2019-02-05 00:00:00 | Adam Wilman | 1 | GHAP A | 1 | Bramhall Village A | Adam Wilman | 7 | 7 | 1 | Adam Wilman |
| 2018-09-11 00:00:00 | Ade Hancox | 2 | Astrazeneca A | 2 | Racketeers A | Adam Wilman | 2 | 1 | 2 | Ade Hancox |
| 2018-09-17 00:00:00 | Ade Hancox | 1 | Astrazeneca A | 1 | Racketeers A | Ade Hancox | 3 | 2 | 1.5 | Ade Hancox |
| 2018-09-25 00:00:00 | Ade Hancox | 1 | Astrazeneca A | 1 | Racketeers B | Ade Hancox | 4 | 3 | 1.3333333333333333 | Ade Hancox |
| 2018-09-30 00:00:00 | Ade Hancox | 1 | Astrazeneca A | 1 | Syddal Park B | Ade Hancox | 5 | 4 | 1.25 | Ade Hancox |
| 2018-10-09 00:00:00 | Ade Hancox | 5 | Astrazeneca A | 5 | Carrington A | Ade Hancox | 10 | 5 | 2 | Ade Hancox |
+---------------------+-------------+---------------+---------------+--------------+--------------------+-------------+-----------+------------+--------------------+--------------+