Question

我认为我需要学习如何更优雅地编写以下代码。问题是我正在处理一堆表（不是由我创建的表，否则我会简化为一个表。）而且我需要一次针对所有表查询信息。我正在使用MS Access，这是我目前的SQL语句：

SELECT [Date (mm-dd-yy)], [Operator], [Operator Number], [Product Part Number], [Feet Produced], [Run Time], [Feet Produced]/[Run Time] AS [AVG Prod]
From [tblReports_16Braiding]
WHERE ((([Product Part Number])=[Forms]![AdminProdForm].[PartNumber]) AND [Date (mm-dd-yy)] Between [Forms]![AdminProdForm].[StartDate] And [Forms]![AdminProdForm].[EndDate]);
    Union
    SELECT [Date (mm-dd-yy)], [Operator], [Operator Number], [Product Part Number], [Feet Produced], [Run Time], [Feet Produced]/[Run Time] AS [AVG Prod]
From  [tblReports_24Braiding]
WHERE ((([Product Part Number])=[Forms]![AdminProdForm].[PartNumber]) AND [Date (mm-dd-yy)] Between [Forms]![AdminProdForm].[StartDate] And [Forms]![AdminProdForm].[EndDate]);
    Union
SELECT [Date (mm-dd-yy)], [Operator], [Operator Number], [Product Part Number], [Feet Produced], [Run Time], [Feet Produced]/[Run Time] AS [AVG Prod]
From [tblReports_Cabling]
WHERE ((([Product Part Number])=[Forms]![AdminProdForm].[PartNumber]) AND [Date (mm-dd-yy)] Between [Forms]![AdminProdForm].[StartDate] And [Forms]![AdminProdForm].[EndDate]);
Union
SELECT [Date (mm-dd-yy)], [Operator], [Operator Number], [Product Part Number], [Feet Produced], [Run Time], [Feet Produced]/[Run Time] AS [AVG Prod]
 From [tblReports_CompChain]
WHERE ((([Product Part Number])=[Forms]![AdminProdForm].[PartNumber]) AND [Date (mm-dd-yy)] Between [Forms]![AdminProdForm].[StartDate] And [Forms]![AdminProdForm].[EndDate]);
Union
SELECT [Date (mm-dd-yy)], [Operator], [Operator Number], [Product Part Number], [Feet Produced], [Run Time], [Feet Produced]/[Run Time] AS [AVG Prod]
From [tblReports_Jacketing]
WHERE ((([Product Part Number])=[Forms]![AdminProdForm].[PartNumber]) AND [Date (mm-dd-yy)] Between [Forms]![AdminProdForm].[StartDate] And [Forms]![AdminProdForm].[EndDate]);
Union
SELECT [Date (mm-dd-yy)], [Operator], [Operator Number], [Product Part Number], [Feet Produced], [Run Time], [Feet Produced]/[Run Time] AS [AVG Prod]
From [tblReports_Primary]
WHERE ((([Product Part Number])=[Forms]![AdminProdForm].[PartNumber]) AND [Date (mm-dd-yy)] Between [Forms]![AdminProdForm].[StartDate] And [Forms]![AdminProdForm].[EndDate]);
Union
SELECT [Date (mm-dd-yy)], [Operator], [Operator Number], [Product Part Number], [Feet Produced], [Run Time], [Feet Produced]/[Run Time] AS [AVG Prod]
From [tblReports_Printing]
WHERE ((([Product Part Number])=[Forms]![AdminProdForm].[PartNumber]) AND [Date (mm-dd-yy)] Between [Forms]![AdminProdForm].[StartDate] And [Forms]![AdminProdForm].[EndDate]);
Union
SELECT [Date (mm-dd-yy)], [Operator], [Operator Number], [Product Part Number], [Feet Produced], [Run Time], [Feet Produced]/[Run Time] AS [AVG Prod]
From [tblReports_Respool]
WHERE ((([Product Part Number])=[Forms]![AdminProdForm].[PartNumber]) AND [Date (mm-dd-yy)] Between [Forms]![AdminProdForm].[StartDate] And [Forms]![AdminProdForm].[EndDate]);
UNION SELECT [Date (mm-dd-yy)], [Operator], [Operator Number], [Product Part Number], [Feet Produced], [Run Time], [Feet Produced]/[Run Time] AS [AVG Prod]
 From [tblReports_Stranding]
WHERE ((([Product Part Number])=[Forms]![AdminProdForm].[PartNumber]) AND [Date (mm-dd-yy)] Between [Forms]![AdminProdForm].[StartDate] And [Forms]![AdminProdForm].[EndDate]);

简而言之，我只是试图将大量的表合并在一起。全部具有相同的字段，从另外两个字段的简单划分中创建一个新字段，然后使用表单查询联合表。每当我现在运行此命令时，都会收到一个错误，提示我的SQL错误或过于复杂。我猜测太复杂了，因为我正在处理九个表中的20,000多个记录。

编辑~~~

在我最大的表上删除操作Expression时，大约有8000个条目，代码工作正常。进行此操作：

[Feet Produced]/[Run Time] AS [AVG Prod]
    From  [tblReports_24Braiding]

但是我在查询中需要此字段。我无法在表本身中执行此操作，因为它是链接表，因此无法保存对其的更改。

Answer 1

明确声明参数，以使Access不受猜测：

PARAMETERS
    [Forms]![AdminProdForm].[PartNumber]) Long,
    [Forms]![AdminProdForm].[StartDate] DateTime,
    [Forms]![AdminProdForm].[EndDate] DateTime;

SELECT 
    [Date (mm-dd-yy)], [Operator], [Operator Number], [Product Part Number], [Feet Produced], [Run Time], [Feet Produced]/[Run Time] AS [AVG Prod]
FROM 
    [tblReports_16Braiding]
WHERE 
    ((([Product Part Number])=[Forms]![AdminProdForm].[PartNumber]) AND [Date (mm-dd-yy)] Between [Forms]![AdminProdForm].[StartDate] And [Forms]![AdminProdForm].[EndDate]);

UNION ALL

SELECT ...  <snip>

“表达不正确或太复杂”

1 个答案: