MS-Access查询 - 在其他条件中包含Null值

Question

请帮助，因为这是一个有很多参数的游泳，但是当它说 ＆＃34; （（OrderProdDetails.DeliveryDate）像IIf（[Forms]！[ReportCriteriaSelection]！[NoDevDate] = - 1，＆＃34; *＆＃34;，＆＃34;＆＃34;））＆＃34;它应该包含空值，但如果我使用此条件设置或者为空则不是这样，那么无论是否选中复选框，它都适用于这两种情况。选中复选框时，请帮助获取包含的空值。

请查看截图：

Query in design View

Criteria Selection Screen

查询：

SELECT OrderCustMain.OdrID, OrderCustMain.CustName, OrderCustMain.CustEmail,
OrderCustMain.OdrDate, OrderProdDetails.DeliveryDate, Date()-
[OrderCustMain]![OdrDate] AS [Days Past], OrderCustMain.OrderStatus, 
OrderProdDetails.BrandName, OrderProdDetails.ModelName, 
OrderProdDetails.Priority, SupplierDetails.SupEmail, OrderProdDetails.Status 
FROM SupplierDetails INNER JOIN (OrderCustMain INNER JOIN OrderProdDetails 
ON OrderCustMain.[OdrID] = OrderProdDetails.[OrdID]) ON 
SupplierDetails.SupOrgName = OrderProdDetails.BrandName WHERE 
(((OrderCustMain.OdrDate) Like IIf([Forms]![ReportCriteriaSelection]!
[NoStDate]=-1,"*","")) AND ((OrderProdDetails.DeliveryDate) Like 
IIf([Forms]![ReportCriteriaSelection]![NoDevDate]=-1,"*","")) AND ((Date()-
[OrderCustMain]![OdrDate])>=[Forms]![ReportCriteriaSelection]![cboDaysPast]) 
AND ((OrderCustMain.OrderStatus) Like IIf(IsNull([Forms]!
[ReportCriteriaSelection]![RepCritOdrStatus]),"*",[Forms]!
[ReportCriteriaSelection]![RepCritOdrStatus])) AND 
((OrderProdDetails.BrandName) Like IIf(IsNull([Forms]!
[ReportCriteriaSelection]![RepCritBrandName]),"*",[Forms]!
[ReportCriteriaSelection]![RepCritBrandName]))) OR 
(((OrderCustMain.OdrDate)>=[Forms]![ReportCriteriaSelection]!
[RepCritOdrStDate] And (OrderCustMain.OdrDate)<=[Forms]!
[ReportCriteriaSelection]![RepCritOdrEndDate]) AND 
((OrderProdDetails.DeliveryDate)>=[Forms]![ReportCriteriaSelection]!
[RepCritDlvryStDate] And (OrderProdDetails.DeliveryDate)<=[Forms]!
[ReportCriteriaSelection]![RepCritDlvryEndDate]) AND ((Date()-
[OrderCustMain]![OdrDate])>=[Forms]![ReportCriteriaSelection]![cboDaysPast]) 
AND ((OrderCustMain.OrderStatus) Like IIf(IsNull([Forms]!
[ReportCriteriaSelection]![RepCritOdrStatus]),"*",[Forms]!
[ReportCriteriaSelection]![RepCritOdrStatus])) AND 
((OrderProdDetails.BrandName) Like IIf(IsNull([Forms]!
[ReportCriteriaSelection]![RepCritBrandName]),"*",[Forms]!
[ReportCriteriaSelection]![RepCritBrandName]))) OR (((OrderCustMain.OdrDate) 
Like IIf([Forms]![ReportCriteriaSelection]![NoStDate]=-1,"*","")) AND 
((OrderProdDetails.DeliveryDate)>=[Forms]![ReportCriteriaSelection]!
[RepCritDlvryStDate] And (OrderProdDetails.DeliveryDate)<=[Forms]!
[ReportCriteriaSelection]![RepCritDlvryEndDate]) AND ((Date()-
[OrderCustMain]![OdrDate])>=[Forms]![ReportCriteriaSelection]![cboDaysPast]) 
AND ((OrderCustMain.OrderStatus) Like IIf(IsNull([Forms]!
[ReportCriteriaSelection]![RepCritOdrStatus]),"*",[Forms]!
[ReportCriteriaSelection]![RepCritOdrStatus])) AND 
((OrderProdDetails.BrandName) Like IIf(IsNull([Forms]!
[ReportCriteriaSelection]![RepCritBrandName]),"*",[Forms]!
[ReportCriteriaSelection]![RepCritBrandName]))) OR 
(((OrderCustMain.OdrDate)>=[Forms]![ReportCriteriaSelection]!
[RepCritOdrStDate] And (OrderCustMain.OdrDate)<=[Forms]!
[ReportCriteriaSelection]![RepCritOdrEndDate]) AND 
((OrderProdDetails.DeliveryDate) Like IIf([Forms]![ReportCriteriaSelection]!
[NoDevDate]=-1,"*","")) AND ((Date()-[OrderCustMain]![OdrDate])>=[Forms]!
[ReportCriteriaSelection]![cboDaysPast]) AND ((OrderCustMain.OrderStatus) 
Like IIf(IsNull([Forms]![ReportCriteriaSelection]![RepCritOdrStatus]),"*",
[Forms]![ReportCriteriaSelection]![RepCritOdrStatus])) AND 
((OrderProdDetails.BrandName) Like IIf(IsNull([Forms]!
[ReportCriteriaSelection]![RepCritBrandName]),"*",[Forms]!
[ReportCriteriaSelection]![RepCritBrandName]))) ORDER BY   
OrderCustMain.OdrID, OrderProdDetails.Priority;

Answer 1

麻烦的主要来源是日期不是字符串，所以＆＃34;日期像某些字符串＆＃34;将失败或返回意外结果。

您必须从头开始重新设计。具体取决于具体情况。

Answer 2

这样的事情有帮助吗？

WHERE Nz(OrderCustMain.OdrDate, #1/1/1900#) >= IIf([Forms]![ReportCriteriaSelection]!
[NoStDate]=-1,Nz(OrderCustMain.OdrDate, #1/1/1900#),[Forms]![ReportCriteriaSelection]!
[RepCritOdrStDate])

它可能会简化代码。