Question

我挠头，因为我不知道如何在MS Access中创建一个总和，我尝试了IIF语句，DSUM语句和子查询（这是我的首选）

非常简单，我有一个足球队的名单，他们的比赛日期以及他在每场比赛中收集的积分，我想创建一个总计。

我的查询没有计算应有的总和，只是计算当前的游戏。

下面是我尝试的代码，有人可以帮忙吗？

SELECT Team, FORMAT(mDate, "yyyy-mm-dd") AS Match_Date, Pts, 
SUM(IIF(FORMAT(mDate, "yyyy-mm-dd") <= FORMAT(mDate, "yyyy-mm-dd"),Pts)) AS Total_Pts
FROM 
(SELECT * FROM
(SELECT home_team AS Team, match_date AS mDate, IIF(home_goals > away_goals,3,IIF(home_goals = away_goals,1,0)) AS Pts FROM A WHERE league = "Premiership" AND season = "2016 - 2017" AND home_team = "Arsenal"  
UNION  
SELECT away_team AS Team, match_date AS mDate, IIF(home_goals < away_goals,3,IIF(home_goals = away_goals,1,0)) AS Pts FROM A WHERE league = "Premiership" AND season = "2016 - 2017" AND away_team = "Arsenal")  AS Filter ORDER BY 2 DESC)  AS Test
GROUP BY Team, FORMAT(mDate, "yyyy-mm-dd"), Pts
ORDER BY 2 DESC;

Answer 1

首先：不要将日期格式化为字符串，也不要将它们当作日期进行比较。

然后：为了能够将UNION查询自身连接起来，该查询必须被写入两次，每个查询都有自己的别名。其中一个查询将用于当前游戏记录，另一个查询用于建立积分的总和。连接两侧的Team必须相等，“运行”查询的mDate必须小于或等于当前游戏的mDate。由于UNION的第一部分的记录与第二部分的记录不同，因此您可以使用UNION ALL来加快查询速度：

SELECT Games.Team, Games.mDate, Games.Pts, SUM(Runnings.Pts) AS Total_Pts
FROM
(
    SELECT home_team AS Team, match_date AS mDate, IIF(home_goals > away_goals,3,IIF(home_goals = away_goals,1,0)) AS Pts
    FROM A WHERE league = "Premiership" AND season = "2016 - 2017" AND home_team = "Arsenal"
    UNION ALL
    SELECT away_team AS Team, match_date AS mDate, IIF(home_goals < away_goals,3,IIF(home_goals = away_goals,1,0)) AS Pts
    FROM A WHERE league = "Premiership" AND season = "2016 - 2017" AND away_team = "Arsenal"
) AS Games
INNER JOIN
(
    SELECT home_team AS Team, match_date AS mDate, IIF(home_goals > away_goals,3,IIF(home_goals = away_goals,1,0)) AS Pts
    FROM A WHERE league = "Premiership" AND season = "2016 - 2017" AND home_team = "Arsenal"
    UNION ALL
    SELECT away_team AS Team, match_date AS mDate, IIF(home_goals < away_goals,3,IIF(home_goals = away_goals,1,0)) AS Pts
    FROM A WHERE league = "Premiership" AND season = "2016 - 2017" AND away_team = "Arsenal"
) AS Runnings ON Games.Team = Runnings.Team AND Games.mDate >= Runnings.mDate
GROUP BY Games.Team, Games.mDate, Games.Pts
ORDER BY Games.Team, Games.mDate;

MS Access SQL运行总计

1 个答案: