Sql 计数项目时完全外部连接访问

我正在尝试在Access中创建一个完整的外部联接，同时计算项目并获取百分比

这是我的密码：

SELECT Main.Draft, Count(Main.Draft) AS MainCount, (Count([Main.Draft])/(Select Count(Main.Draft) from Main)) AS Percentage
FROM Main LEFT JOIN Main_ChangeLog ON Main.ID = Main_ChangeLog.ID
GROUP BY Main.Draft;
UNION ALL 
SELECT Main.Draft, Count(Main.Draft) AS MainCount, (Count([Main.Draft])/(Select Count(Main.Draft) from Main)) AS Percentage
FROM Main RIGHT JOIN Main_ChangeLog ON Main.ID = Main_ChangeLog.ID
WHERE (((Main.Date) Between [Forms]![Main Reports]![txtbegin] And [Forms]![Main Reports]![txtend]))
GROUP BY Main.Draft;

以下是我的结果：

Version_1   1   0
Version_2   1   0   
Version_3   3   0
Version_1   4   0
Version_2   3   0

以下是我想要的结果：

Version_1   5   0.50
Version_2   4   0.15
Version_3   3   0.35

以下是主表：

ID  CreateDate  FirstName   LastName   Draft

1   10/01/2020   First       One        Version_2
2   11/20/2020   Second      Person     Version_3
3   11/20/2020   Third       Girl       Version_3
4   11/21/2020   Fourth      Boy        Version_3
5   11/22/2020   Fifth       Guy        Version_1

以下是主要的变更记录表：

ID CreateDate    FirstName   LasteName   Draft
1  9/10/2020      First       One       Version_1
2  9/10/2020      Second      Person    Version_1
2  10/10/2020     Second      Person    Version_2
3  9/10/2020      Third       Girl      Version_1
3  10/10/2020     Third       Girl      Version_2
4  9/5/2020       Fourth      Boy       Version_1
4  10/10/2020     Fourth      Boy       Version_2

每次更新主表上的记录时，前一条记录都存储在主更改日志中。这有助于了解每月创建了多少版本

我刚刚将代码修改为：

  SELECT t.Draft, Count(t.Count) AS DraftCount, (Count(t.Draft)/(Select Count(t.Draft) from Main)) AS [Percentage]
    FROM 
    (SELECT Main.Draft as Draft, Main.Draft as [Count]
    FROM MainLEFT JOIN Main_ChangeLog ON Main.ID = Main_ChangeLog.ID 
    WHERE (((Main.Date) Between [Forms]![Main Reports]![txtbegin] And [Forms]![Main Reports]![txtend]))
    UNION ALL 
    SELECT Main.Draft AS Draft, Main.Draft as [Count]
    FROM MainRIGHT JOIN Main_ChangeLog ON Main.ID = Main_ChangeLog.ID
    WHERE (((Main.Date) Between [Forms]![Main Reports]![txtbegin] And [Forms]![Main Reports]![txtend])))  AS t
    GROUP BY t.Draft

现在我得到了这个错误：

Subquery returned more than 1 value. This is not permitted when the subquery follows =, !=, <, <= , >, >= or when the subquery is used as an expression.

子查询返回了多个值。当子查询在=、！=、=或者当子查询用作表达式时。

---

谢谢。

这是一种通过两个查询完成的方法：

第一个查询（我们称之为

qryMainData

）将使用

UNION all

将所有版本数据连接在一起：

第二个查询将基于第一个查询，因为您希望使用查询1的整个结果集的总计数（

qryMainData

）来计算百分比：

---

MS Access允许您在计算中使用字段别名。我还使用了

ROUND

函数将结果四舍五入到小数点后两位。

请在表格中显示数据。很难遵循计算结果。分数是如何计算的？并描述您要实现的逻辑。首先执行

union all

并对结果进行分组。我尝试了这样做，但没有成功，因为我在两个查询中都有聚合函数。我甚至尝试将聚合函数移到底部查询，但也没有成功。如何计算所需的百分比，如

version\uu

1的50%？我可以看到1/5或5/12。我正在尝试将所选草稿的总数除以所有草稿的总数。

SELECT ID, Draft, CreateDate FROM Main
UNION ALL 
SELECT ID, Draft, CreateDate FROM Main_ChangeLog;

SELECT Draft, Count(ID) as DraftQty, (SELECT COUNT(ID) FROM qryMainData) as TotalDraftQty,
ROUND(DraftQty/TotalDraftQty, 2) as DraftPercentage
FROM qryMainData
WHERE CreateDate Between [Forms]![Main Reports]![txtbegin] And [Forms]![Main Reports]![txtend]
GROUP BY Draft