sql - 如何在 Excel VBA 中嵌套查询

Question

我不确定是否可能，但我正在尝试嵌套查询。
首先，我创建以下 2 个查询:

MyQuery = "Select * from " & "T1"
MyQuery2 = "Select * from " & "T2" 

然后我想比较两个查询并以下列方式返回差异:

mkQry = "SELECT (" & MyQuery & ").*" _
                & "FROM (" & MyQuery & ") LEFT JOIN (" & MyQuery2 & ") ON " _
                & "(" & MyQuery & ".F1) = " & MyQuery2 & ".F1) AND " _
                & "(" & MyQuery & ".F2 =  " & MyQuery2 & ".F2) AND " _
                & "(" & MyQuery & ".F3 =  " & MyQuery2 & ".F3) AND " _
                & "(" & MyQuery & ".F4 =  " & MyQuery2 & ".F4) AND " _
                & "(" & MyQuery & ".F5 =  " & MyQuery2 & ".F5)" _
                & "WHERE (((" & MyQuery2 & ".F5) Is Null))"
                
        Set MyRecordset99 = MyConnection2.Execute(mkQry)
        Worksheets("TST").Range("A1").CopyFromRecordset MyRecordset99

但是，mkQry包含 syntax error我不知道如何解决这个问题。
我的问题是:
是否可以按我尝试的方式或多或少地嵌套查询，如果是这样，我如何更新语法以使其工作。

Answer 1

您应该为每个子查询设置别名，然后在整个过程中使用别名。

mkQry = "SELECT x.* " _
                & "FROM (" & MyQuery & ") x LEFT JOIN (" & MyQuery2 & ") y ON " _
                & "(x.F1 = y.F1) AND " _
                ...
                & "(x.F5 = y.F5) " _
                & "WHERE (((y.F5) Is Null))"