SQL查询中的MS Access VBA数据类型不匹配错误 [英] MS Access VBA Data Type Mismatch Error in SQL Query
问题描述
我目前有以下MS Access SQL查询，它是Access VBA功能的一部分。它是在先前的问题，您可以查看该问题以更好地了解其工作原理。
I currently have the following MS Access SQL Query which is part of an Access VBA function. It has been built with help from a previous question, which you can look at to better understand how it works.
sqlJoinQuery = "SELECT tbl_grp_by.[Field1],tbl_grp_by.[Field2], " & _
"Switch( " & _
"Nz(tbl_grp_by.[maxfield3]) = 0, '0', " & _
"Nz(tbl_grp_by.[maxfield3]) = 1, '>1 million', " & _
"Nz(tbl_grp_by.[maxfield3]) = 2, '0001-0010' " & _
") as [Field3], " & _
"tbl_grp_by.[" + commonField + "], " & _
"[" + tableName + "].* " & _
"INTO [" + newTableName + "] FROM (" & _
"SELECT Max([" + tableNameTemp + "].[Field1]) as [Field1], " & _
"Max([" + tableNameTemp + "].[Field2]) as [Field2], " & _
"Max(Switch( " & _
"Nz([" + tableNameTemp + "].[Field3]) = '0' , 0, " & _
"Nz([" + tableNameTemp + "].[Field3]) = '>1 million' , 1, " & _
"Nz([" + tableNameTemp + "].[Field3]) = '0001-0010', 2 " & _
"))as [maxField3], " & _
"[" + tableNameTemp + "].[" + commonField + "] as [" + commonField + "] " & _
"FROM [" + tableNameTemp + "] " & _
"INNER JOIN [" + tableName + "] " & _
"ON [" + tableNameTemp + "].[" + commonField + "] = [" + tableName + "].[" + commonField + "] " & _
"GROUP BY [" + tableNameTemp + "].[" + commonField + "] " & _
") as tbl_grp_by " & _
"INNER JOIN [" + tableName + "] " & _
"ON [" + tableName + "].[" + commonField + "] = tbl_grp_by.[" + commonField + "]"
上面的Access查询将导致此SQL字符串：
The above Access query results in this SQL String:
SELECT tbl_grp_by.[Field1],
tbl_grp_by.[Field2],
Switch(Nz(tbl_grp_by.[maxfield3]) = 0, '0', Nz(tbl_grp_by.[maxfield3]) = 1, '>1 million', Nz(tbl_grp_by.[maxfield3]) = 2, '0001-0010') AS [Field3],
tbl_grp_by.[Finding ID],
[Issue_Management_Findings].* INTO [region_Issue_Management_Findings]
FROM
(SELECT Max([temp2_temp_Issue_Management_Findings].[Field1]) AS [Field1],
Max([temp2_temp_Issue_Management_Findings].[Field2]) AS [Field2],
Max(Switch(Nz([temp2_temp_Issue_Management_Findings].[Field3]) = '0', 0, Nz([temp2_temp_Issue_Management_Findings].[Field3]) = '>1 million', 1, Nz([temp2_temp_Issue_Management_Findings].[Field3]) = '0001-0010', 2))AS [maxField3],
[temp2_temp_Issue_Management_Findings].[Finding ID] AS [Finding ID]
FROM [temp2_temp_Issue_Management_Findings]
INNER JOIN [Issue_Management_Findings] ON Nz([temp2_temp_Issue_Management_Findings].[Finding ID]) = Nz([Issue_Management_Findings].[Finding ID])
GROUP BY [temp2_temp_Issue_Management_Findings].[Finding ID]) AS tbl_grp_by
INNER JOIN [Issue_Management_Findings] ON Nz([Issue_Management_Findings].[Finding ID]) = Nz(tbl_grp_by.[Finding ID])
因此[Field3]在内部查询中的max（）下编码，并且max被解码在外部查询中。
So [Field3] is encoded under max() in the inner query and that max is decoded in outer query.
但是，当我运行它时，出现以下错误：
However, when I run it I get the following error:
运行-time error'3464'：条件表达式中的数据类型不匹配
Run-time error '3464': Data type mismatch in criteria expression
如果我在即时窗口中从调试输出中复制了我的SQL查询，并且将其粘贴到手动SQL查询中（在将我的VBA代码运行到应该在其中运行SQL查询的断点之后），然后出现以下错误：
If I copy my SQL query from debug output in the immediate window and paste it in a manual SQL query (after running my VBA code up to a breakpoint where the SQL query should be run), then I get the following error:
条件表达式中的数据类型不匹配
Data type mismatch in criteria expression
如果仅出于调试目的在上述SQL字符串中运行子查询，则： / p>
If I only run the subquery in my above SQL string for debugging purposes:
(SELECT Max([temp2_temp_Issue_Management_Findings].[Field1]) AS [Field1],
Max([temp2_temp_Issue_Management_Findings].[Field2]) AS [Field2],
Max(Switch(Nz([temp2_temp_Issue_Management_Findings].[Field3]) = '0', 0, Nz([temp2_temp_Issue_Management_Findings].[Field3]) = '>1 million', 1, Nz([temp2_temp_Issue_Management_Findings].[Field3]) = '0001-0010', 2))AS [maxField3],
[temp2_temp_Issue_Management_Findings].[Finding ID] AS [Finding ID]
FROM [temp2_temp_Issue_Management_Findings]
INNER JOIN [Issue_Management_Findings] ON Nz([temp2_temp_Issue_Management_Findings].[Finding ID]) = Nz([Issue_Management_Findings].[Finding ID])
GROUP BY [temp2_temp_Issue_Management_Findings].[Finding ID])
然后它运行无误
请注意，问题管理发现是数据库中现有表的名称。
Note that Issue_Management_Findings is the name of an existing table in the database.
有人知道我该如何解决这些错误？
Does anybody know how I could fix these errors?
推荐答案
我认为您必须在 Switch 上添加默认返回值，以防万一它不符合所有其他条件，不会返回 Null ，我认为这会导致数据类型不匹配问题。您可以只添加 ...，true， thedefaultvalue）例如
I think you have to add default return value on your Switch just in case it fails to match all the other criteria so it wont return Null which I believe cause the Data Type mismatch issue. You can just add ...,true,"thedefaultvalue") e.g.
SWITCH (field>100, "greater", field3=100 ,"equals", true, "default")
so在您的查询中。我默认将其设置为 0 ;
so in your query. I default it to 0;
sqlJoinQuery = "SELECT tbl_grp_by.[Field1],tbl_grp_by.[Field2], " & _
"Switch( " & _
"Nz(tbl_grp_by.[maxfield3]) = 0, '0', " & _
"Nz(tbl_grp_by.[maxfield3]) = 1, '>1 million', " & _
"Nz(tbl_grp_by.[maxfield3]) = 2, '0001-0010' " & _
", true,'0') as [Field3], " & _
"tbl_grp_by.[" + commonField + "], " & _
"[" + tableName + "].* " & _
"INTO [" + newTableName + "] FROM (" & _
"SELECT Max([" + tableNameTemp + "].[Field1]) as [Field1], " & _
"Max([" + tableNameTemp + "].[Field2]) as [Field2], " & _
"Max(Switch( " & _
"Nz([" + tableNameTemp + "].[Field3]) = '0' , 0, " & _
"Nz([" + tableNameTemp + "].[Field3]) = '>1 million' , 1, " & _
"Nz([" + tableNameTemp + "].[Field3]) = '0001-0010', 2 " & _
", true, 0))as [maxField3], " & _
"[" + tableNameTemp + "].[" + commonField + "] as [" + commonField + "] " & _
"FROM [" + tableNameTemp + "] " & _
"INNER JOIN [" + tableName + "] " & _
"ON [" + tableNameTemp + "].[" + commonField + "] = [" + tableName + "].[" + commonField + "] " & _
"GROUP BY [" + tableNameTemp + "].[" + commonField + "] " & _
") as tbl_grp_by " & _
"INNER JOIN [" + tableName + "] " & _
"ON [" + tableName + "].[" + commonField + "] = tbl_grp_by.[" + commonField + "]"
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