如何在 ms 访问中从数据透视表中进行选择

Question

我有两张桌子：

和

我需要这样的东西：

HeaderID   |  Position1    |  IsSuccessful  |  Position2  |  IsSuccessful
-------------------------------------------------------------------------
    24719  |     gold_box  |        true    |  propname25 |        false
    24720  |       beyond  |        false   |        wtv  |        false
    24721  |      red_box  |        false   |      wtv22  |         true

到目前为止我已经做到了：

TRANSFORM Max(Proposals.PropName) AS MaxOfPropName
SELECT Headers.HeaderID
FROM Headers INNER JOIN Proposals ON Headers.ProposalID = Proposals.ProposalID
GROUP BY Headers.HeaderID
PIVOT Headers.Position;



HeaderID   |  Position1    |  Position2  |
------------------------------------------
    24719  |     gold_box  |  propname25 |
    24720  |       beyond  |        wtv  |
    24721  |      red_box  |      wtv22  |

现在我正在考虑从数据透视表中进行选择，但它不起作用，并且在网上找不到任何文档，例如：

select * from (
   TRANSFORM Max(Proposals.PropName) AS MaxOfPropName
   SELECT Headers.HeaderID
   FROM Headers INNER JOIN Proposals ON Headers.ProposalID = Proposals.ProposalID
   GROUP BY Headers.HeaderID
   PIVOT Headers.Position;
 )

有没有办法在另一个选择查询（ms 访问）中使用数据透视表的结果？如何？ 稍后我将不得不使用带有 7 个表的单个查询，并将它们与另外 3 个数据透视表连接起来...... :) 对于这个问题，我很抱歉，但我被卡住了

谢谢

Answer 1

考虑将带有两个内连接的派生表子查询添加到每个职位的已保存交叉表查询。如果存在更多职位，请添加更多子查询。

CrossTab 查询（另存为单独的查询以用于下面的主查询）

TRANSFORM Max(Proposals.PropName) AS MaxOfPropName 
SELECT Headers.HeaderID 
FROM Headers 
INNER JOIN Proposals ON Headers.ProposalID = Proposals.ProposalID 
GROUP BY Headers.HeaderID 
PIVOT Headers.Position

主要查询

SELECT crosstabQ.HeaderID, crosstabQ.Position1, pos1.IsSuccessful, 
       crosstabQ.Position2, pos2.IsSuccessful 
FROM (crosstabQ    

INNER JOIN    
   (SELECT IsSuccessful 
    FROM Headers
    WHERE Position = 1) AS pos1
ON pos1.HeaderID = crosstabQ.HeaderID)

INNER JOIN    
   (SELECT IsSuccessful
    FROM Headers
    WHERE Position = 2) AS pos2    
ON crosstabQ.HeaderID = pos2.HeaderID

---

或者，运行条件​​聚合，这是数据透视查询的通用版本（这里的布尔值将返回整数、0 或 -1）：

SELECT Headers.HeaderID, 
       Max(IIF(Headers.Position=1, Proposals.PropName, NULL)) As Position1,
       Max(IIF(Headers.Position=1, Headers.IsSuccessful, NULL)) As IsSuccessful1,
       Max(IIF(Headers.Position=2, Proposals.PropName, NULL)) As Position2,
       Max(IIF(Headers.Position=2, Headers.IsSuccessful, NULL)) As IsSuccessful2
FROM Headers 
INNER JOIN Proposals ON Headers.ProposalID = Proposals.ProposalID 
GROUP BY Headers.HeaderID