MySQL：基于条件的单列前n条和后n条记录之和

是否可以从单个列计算前5次和后5次的总和？我的情况是，我必须使用查询来计算它

我必须计算前5次的总和并在不同的列中显示，同样地，我必须计算最后5次的总和并在另一列中显示。我的桌子是这样的：

Overs runs players

1   1     p1           
1   1     p2
1   4     p2
1   1     p2
1   0     p1
1   0     p1
2   1     p2
2   2     p1
2   3     p1
2   1     p2

SELECT player_key, 
    sum(runs) as first5overSum
FROM `batsman_scores`
WHERE over<=5 
group by player_key

SELECT bs.player_key, 
       SUM(CASE WHEN bs.over <= 5 THEN bs.runs ELSE 0 END) as first5overSum,
       SUM(CASE WHEN bs.over > bs2.max_over - 5 THEN bs.runs ELSE 0 END) as last5overSum,
FROM batsman_scores bs CROSS JOIN
     (SELECT MAX(bs2.over) as max_over
      FROM batsman_scores bs2
     ) bs2
WHERE bs.over <= 5 
GROUP BY bs.player_key

现在，它应该计算每个球员的前五局和后五局的总和，并告诉我哪些球员在前五局中得分多少，以及他们在最后五局中得分多少

players first5overSum last5overSum

 p1        40               0
 p2        50             120
 p3        10              60

MySQL查询如下所示：

Overs runs players

1   1     p1           
1   1     p2
1   4     p2
1   1     p2
1   0     p1
1   0     p1
2   1     p2
2   2     p1
2   3     p1
2   1     p2

SELECT player_key, 
    sum(runs) as first5overSum
FROM `batsman_scores`
WHERE over<=5 
group by player_key

SELECT bs.player_key, 
       SUM(CASE WHEN bs.over <= 5 THEN bs.runs ELSE 0 END) as first5overSum,
       SUM(CASE WHEN bs.over > bs2.max_over - 5 THEN bs.runs ELSE 0 END) as last5overSum,
FROM batsman_scores bs CROSS JOIN
     (SELECT MAX(bs2.over) as max_over
      FROM batsman_scores bs2
     ) bs2
WHERE bs.over <= 5 
GROUP BY bs.player_key

我能够计算出前5个回合的记录，但我不知道如何将每个球员最后5个回合的总和显示在一起并显示出来

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请给我建议或解决方案。我会非常感激的

我认为可以使用条件聚合。我不太确定前五个和后五个是什么意思，但查询看起来像这样：

Overs runs players

1   1     p1           
1   1     p2
1   4     p2
1   1     p2
1   0     p1
1   0     p1
2   1     p2
2   2     p1
2   3     p1
2   1     p2

SELECT player_key, 
    sum(runs) as first5overSum
FROM `batsman_scores`
WHERE over<=5 
group by player_key

SELECT bs.player_key, 
       SUM(CASE WHEN bs.over <= 5 THEN bs.runs ELSE 0 END) as first5overSum,
       SUM(CASE WHEN bs.over > bs2.max_over - 5 THEN bs.runs ELSE 0 END) as last5overSum,
FROM batsman_scores bs CROSS JOIN
     (SELECT MAX(bs2.over) as max_over
      FROM batsman_scores bs2
     ) bs2
WHERE bs.over <= 5 
GROUP BY bs.player_key

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你说的前五个是什么意思？这意味着前五个是什么意思？根据你的数据p1有两个overs overs=1,2，那么你如何得到p1的第一个和最后五个呢？这是一种澄清的方式，确保你得到人们的帮助！英雄联盟“第一个”和“最后一个”表示排序顺序-您可能希望通过解释您的意思以及如何确定前5个和后5个来重新回答一个合法的问题。您想要投票吗？参见前5次表示=>前5次和后5次