我有一个包含几个表的数据库：[Plan Revenue]、[Plan Revenue Expense]、[Support Provider]、[Z Service Codes New]
我已经编写了一个查询，可以让我计算在过去 6 个月的特定服务代码中为每个提供商列出了多少费用记录。唯一的问题是，理想情况下，我希望它还列出过去 6 个月内未记录任何费用的服务代码的 0。
因此，基本上，我想将 [Z Service Codes New] 表与 [Support Providers] 表交叉，以获得提供者和所有服务代码之间的所有可能匹配。然后，在每个服务代码中，我希望它计算过去 6 个月内的费用记录数（嗯，我实际上已经设置了自定义日期，所以它更灵活）。
但是我一直坚持如何做到这一点，因此它不会将所有费用记录与所有服务代码匹配，而是仅将那些属于正确服务代码的费用记录（如果有）匹配。
[Plan Revenue].[Service] 是与 [Z Service Codes New] 匹配的外键。[Service Code] [Plan Revenue].[Rev ID] 是与 [Plan Revenue Expense] 匹配的外键。 [RevID] [Plan Revenue Expense].[SP] 是与 [Support Provider].[ID] 匹配的外键
不要问我为什么为了简单起见，数据库构建器没有让他们的键从一个表匹配到下一个表。就是这样……
我当前的查询看起来像这样：
SELECT [support provider].[sp last],
[support provider].[sp first],
[support provider].[sp mi],
[support provider].[agency],
[support provider].[de?],
[support provider].[ic?],
[support provider].[agency?] AS [AG?],
[support provider].[generalbus?] AS [GB?],
[ExpsToCount].[counted svc],
Iif(Count([ExpsToCount].[exptocountid]) = 0, 0, Count(
[ExpsToCount].[exptocountid])) AS ExpCount
FROM [support provider]
LEFT JOIN (SELECT [plan revenue expense].[sp] AS [Counted SP],
[z service codes new].[service code] AS [Counted Svc],
[plan revenue expense].[exp id] AS [ExpToCountID]
FROM [z service codes new]
LEFT JOIN ([plan revenue]
LEFT JOIN [plan revenue expense]
ON [plan revenue].[rev id] =
[plan revenue expense].[revid])
ON [z service codes new].[service code] =
[plan revenue].[service]
WHERE ( [plan revenue expense].[checkdt] >=
Format([period beginning "mm/dd/yyyy"], "short date")
AND [plan revenue expense].[checkdt] <=
Format([periond ending "mm/dd/yyyy"], "short date") ))
AS ExpsToCount
ON [ExpsToCount].[counted sp] = [support provider].[id]
WHERE [support provider].[inactive?] = false
AND ( [support provider].[de?] = true
OR [support provider].[ic?] = true )
GROUP BY [support provider].[sp last],
[support provider].[sp first],
[support provider].[sp mi],
[support provider].[agency],
[support provider].[de?],
[support provider].[ic?],
[support provider].[agency?],
[support provider].[generalbus?],
[ExpsToCount].[counted svc]
ORDER BY [ExpsToCount].[counted svc],
[support provider].[agency],
[support provider].[sp last],
[support provider].[sp first],
[support provider].[sp mi],
[ExpsToCount].[counted svc];
[IC?], [DE?], [Agency?], [GeneralBus?]只是表示支持提供者类型的布尔字段。同样，为什么数据库人员选择这个而不是带有外键的单个字段，所以你只能是一种类型的提供者，我不知道......只是滚动它。
所以，我目前也在使用子查询。
但是，它并没有给我没有费用相关的服务代码零。它只是给我计算实际费用，如果我不关心 0 就好了，我有点这样做......如果只是为了我自己的教化。
我觉得我在最后一天左右一直在玩这个东西，我的大脑是朋友。需要第二双眼睛。
我觉得我需要将 [Support Provider] 与 [Z Service Codes New] 交叉加入，以便获得所有可能的匹配项，然后以某种方式选择性地给出 0（如果没有相关的费用记录）或 COUNT（如果有费用）记录。但无论如何，我都希望每个支持提供商都有一个服务代码。
不确定在 Access 中将 CROSS JOIN 与某种 INNER JOIN 或 OUTER JOIN 组合的语法是什么？对于我的目的来说，最好的组合是什么。我可以在没有子查询的情况下以某种方式逃脱，还是我仍然需要它？与 CROSS JOIN 相比，有没有更好的方法来做到这一点？（我认为这就是 CROSS JOIN 的设计目的......但我可能错了吗？）
希望一切都说得通。想法？哦，我正在使用 Access 2003 Professional SP3。
编辑：
好的，我自己的优雅解决方案（好吧，好吧，我不知道它是否优雅，但它有效！）是在我的主 FROM 行中创建两个自定义 SELECT 语句，然后根据两个匹配条件加入两个 SELECT 语句：
SELECT [ProvidersXCodes].[SP Last], [ProvidersXCodes].[SP First], [ProvidersXCodes].[SP MI], [ProvidersXCodes].[Agency], [ProvidersXCodes].[SvcCode], IIf(COUNT([ExpsToCount].[ExpCountID])=0,0,COUNT([ExpsToCount].[ExpCountID])) AS [Exp Count]
FROM (SELECT [Support Provider].[ID] AS [CodeProvider], [Support Provider].[SP Last], [Support Provider].[SP First], [Support Provider].[SP MI], [Support Provider].[Agency], [Z Service Codes New].[Service Code] AS [SvcCode]
FROM [Support Provider], [Z Service Codes New]
WHERE [Support Provider].[Inactive?]=FALSE
AND ([Support Provider].[DE?]=TRUE OR [Support Provider].[IC?]=TRUE)
AND NOT ([Z Service Codes New].[Service Code] LIKE '111*'
OR [Z Service Codes New].[Service Code] LIKE '222*'
OR [Z Service Codes New].[Service Code] LIKE '333*')
GROUP BY [Support Provider].[ID], [Support Provider].[SP Last], [Support Provider].[SP First], [Support Provider].[SP MI], [Support Provider].[Agency], [Z Service Codes New].[Service Code]) AS [ProvidersXCodes]
LEFT JOIN (SELECT [Support Provider].[ID] AS [ExpCountProv], [Plan Revenue].[Service] AS [ExpCountSvc], [Plan Revenue Expense].[Exp ID] AS [ExpCountID]
FROM [Plan Revenue], [Plan Revenue Expense], [Support Provider]
WHERE [Plan Revenue].[Rev ID]=[Plan Revenue Expense].[RevID]
AND [Plan Revenue Expense].[SP]=[Support Provider].[ID]
AND [Support Provider].[Inactive?]=FALSE
AND ([Support Provider].[DE?]=TRUE OR [Support Provider].[IC?]=TRUE)
AND ([Plan Revenue Expense].[CheckDt]>=Format([Period Beginning "MM/DD/YYYY"],"Short Date") AND [Plan Revenue Expense].[CheckDt]<=Format([Periond Ending "MM/DD/YYYY"],"Short Date"))
GROUP BY [Support Provider].[ID], [Plan Revenue].[Service], [Plan Revenue Expense].[Exp ID]) AS [ExpsToCount] ON ([ProvidersXCodes].[CodeProvider]=[ExpsToCount].[ExpCountProv] AND [ProvidersXCodes].[SvcCode]=[ExpsToCount].[ExpCountSvc])
GROUP BY [ProvidersXCodes].[SP Last], [ProvidersXCodes].[SP First], [ProvidersXCodes].[SP MI], [ProvidersXCodes].[Agency], [ProvidersXCodes].[SvcCode]
ORDER BY [ProvidersXCodes].[SvcCode], [ProvidersXCodes].[Agency], [ProvidersXCodes].[SP Last], [ProvidersXCodes].[SP First], [ProvidersXCodes].[SP MI];
问题解决了！
我认为必须用语言表达问题有助于解决问题，因为我让自己考虑实际问题是什么，哪些特定信息需要成为交叉产品，哪些信息需要更标准的连接操作以及如何正确链接这两组...
〜MG（我）