Question

在MS Access中查找以下问题的查询 -

以下是我的数据集，其中最后一行在Value列中为NULL。另外，通过为每个Name + Office + Person + Category执行Max（Value），我已经提取了这些数据以避免多行具有值

ID  Name    Office  Person  Category    Value
1   FMR    Americas Ben       Global    7
1   FMR    London   Ben       Global    5
1   FMR    London   Ben       Overall   4.2
156 Asset  London   Ben       Global    13
156 Asset   London  Ben       Overall   
157  WSR    Paris   Zen       Global      2

我的预期结果集如下 - 我期待十字标记或任何指示符，表明对于ID，姓名，办公室，人员组合具有全局/超量类别的值或不在单行中。我知道它有点类似于“字符串聚合”

ID  Name    Office  Person  Global  Overall
1   FMR     Americas Ben      X 
1   FMR     London   Ben      X       X
156 Asset   London   Ben      X 
157  WSR    Paris    Zen      X

感谢您的投入..

Answer 1

我玩了一下这个。我创建了两个选择查询Global和Overall

全局

SELECT ID，Name，Office，Person，Category AS Global 来自[YourTable] WHERE Category =“Global”AND Value IS NOT NULL

总体

SELECT ID，Name，Office，Person，Category AS Overall 来自[YourTable] WHERE Category =“Overall”AND Value IS NOT NULL

然后我创建了一个新查询来加入选择查询

SELECT g.ID，g.Name，g.Office，g.Person，Global，Overall 来自全球g LEFT JOIN总体o ON g.ID = o.ID AND g.Name = o.Name AND g.Office = o.Office AND g.Person = o.Person

希望这有帮助。

Answer 2

首先，获取唯一ID /名称/办公室组合的列表：

SELECT DISTINCT ID, Name, Office, Person
FROM TableName

接下来，为每个类别创建子查询：对于全球：

SELECT ID, Name, Office, Person
FROM TableName
WHERE Category="Global"

总体而言：

SELECT ID, Name, Office, Person
FROM TableName
WHERE Category="Overall"

最后，将子查询连接到主查询，并使用表达式显示X：

SELECT DISTINCT ID, Name, Office, Person
    Iif(Global.ID Is Not Null, "X") AS IsGlobal,
    Iif(Overall.ID Is Not Null, "X") AS IsOverall
FROM (TableName
LEFT JOIN (
    SELECT ID, Name, Office, Person
    FROM TableName
    WHERE Category="Global"
) AS Global 
ON TableName.ID=Global.ID
    AND TableName.Name=Global.Name
    AND TableName.Office=Global.Office
    AND TableName.Person=Global.Person)
LEFT JOIN (
    SELECT ID, Name, Office, Person
    FROM TableName
    WHERE Category="Overall"
) AS Overall
ON TableName.ID=Overall.ID
    AND TableName.Name=Overall.Name
    AND TableName.Office=Overall.Office
    AND TableName.Person=Overall.Person

您可以更轻松地将子查询保存为Access查询并按名称引用已保存的查询，而不是将整个子查询包含在此查询中。

MS Access查询 - 字符串聚合

2 个答案: