我目前有以下 MS Access SQL 查询,它是 Access VBA 函数的一部分。它是在以下人士的帮助下建造的上一个问题 https://stackoverflow.com/questions/38903010/how-to-sql-join-tables-selecting-the-largest-value-in-access-vba-function,您可以查看它以更好地了解其工作原理。
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 + "]"
上述 Access 查询会产生以下 SQL 字符串:
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() 下进行编码,而 max 在外部查询中进行解码。
但是,当我运行它时,我收到以下错误:
运行时错误“3464”:条件表达式中的数据类型不匹配
如果我从立即窗口中的调试输出复制 SQL 查询并将其粘贴到手动 SQL 查询中(在运行 VBA 代码到应运行 SQL 查询的断点之后),则会收到以下错误:
标准表达式中的数据类型不匹配
如果我仅出于调试目的在上面的 SQL 字符串中运行子查询:
(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])
然后运行就没有错误了
注意问题_管理_调查结果是数据库中现有表的名称。
有谁知道我该如何修复这些错误?