Ms access 为什么我的左连接操作无效（MS ACCESS 2003）

我有一个很像这样的查询：

SELECT * FROM t1 LEFT JOIN t2 ON t1.aNumber = t2.aNumber;

当我试图运行它时，我得到了无效的操作。但以下两个查询运行良好：

SELECT * FROM t1;
SELECT * FROM t2;

所以我猜问题要么很明显要么很复杂。。。在这种情况下，我怎样才能发现问题

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为完整起见，以下是实际查询（查询25）及其引用的所有其他查询：

查询25

SELECT *
FROM [EXPORT PRICE AND Desc] LEFT JOIN Export_Union_active ON [EXPORT PRICE AND Desc].MaterialNumber = Export_Union_active.MaterialNumber;

出口价格和说明

SELECT tblMMMaterials.MaterialNumber, tblMMMaterials.MaterialDescription AS name, Format(tblMMMaterials!SellingPrice,"Standard") AS SellingPrice, dbo_tblMMImages.Notes, tblMMMaterials.MFG, tblMMMaterials.Internet
FROM tblMMMaterials LEFT JOIN dbo_tblMMImages ON tblMMMaterials.MaterialID = dbo_tblMMImages.MaterialID
WHERE (((tblMMMaterials.Internet)=True));

导出联合活动

select * from Export_Active  UNION ALL select  * from Export_Inactive;

SELECT tblMMMaterials.MaterialNumber, tblMMMaterials.Discontinued, 1 AS [check], tblMMMaterials.MFG
FROM tblMMMaterials
WHERE (((tblMMMaterials.Discontinued)=0) AND ((tblMMMaterials.MFG)="kheops"));

SELECT tblMMMaterials.MaterialNumber, tblMMMaterials.Discontinued, 0 AS [check], tblMMMaterials.MFG
FROM tblMMMaterials
WHERE (((tblMMMaterials.Discontinued)=1) AND ((tblMMMaterials.MFG)="kheops"));

导出处于活动状态

select * from Export_Active  UNION ALL select  * from Export_Inactive;

SELECT tblMMMaterials.MaterialNumber, tblMMMaterials.Discontinued, 1 AS [check], tblMMMaterials.MFG
FROM tblMMMaterials
WHERE (((tblMMMaterials.Discontinued)=0) AND ((tblMMMaterials.MFG)="kheops"));

SELECT tblMMMaterials.MaterialNumber, tblMMMaterials.Discontinued, 0 AS [check], tblMMMaterials.MFG
FROM tblMMMaterials
WHERE (((tblMMMaterials.Discontinued)=1) AND ((tblMMMaterials.MFG)="kheops"));

导出非活动的

select * from Export_Active  UNION ALL select  * from Export_Inactive;

SELECT tblMMMaterials.MaterialNumber, tblMMMaterials.Discontinued, 1 AS [check], tblMMMaterials.MFG
FROM tblMMMaterials
WHERE (((tblMMMaterials.Discontinued)=0) AND ((tblMMMaterials.MFG)="kheops"));

SELECT tblMMMaterials.MaterialNumber, tblMMMaterials.Discontinued, 0 AS [check], tblMMMaterials.MFG
FROM tblMMMaterials
WHERE (((tblMMMaterials.Discontinued)=1) AND ((tblMMMaterials.MFG)="kheops"));

下面是所有这些查询所引用的表（它们比这个大得多，但我删掉了任何查询中未使用的内容）：

TBLMM材料

MaterialID          | Number   | PK
MaterialNumber      | Text
MaterialDescription | Text
SellingPrice        | Currency
MFG                 | Text
Internet            | Yes/No
Discontinued        | Yes/No

ImageID    | AutoNumer | PK
MaterialID | Number
Notes      | Memo

tblMMImages

MaterialID          | Number   | PK
MaterialNumber      | Text
MaterialDescription | Text
SellingPrice        | Currency
MFG                 | Text
Internet            | Yes/No
Discontinued        | Yes/No

ImageID    | AutoNumer | PK
MaterialID | Number
Notes      | Memo

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数据类型？请发布您的表模式…@Mitch Wheat当然：）我还添加了文本查询而不是图像查询。。。