訪問sql查詢以連接行

Question

我有csv格式的以下數據，並以訪問格式導出

House Number | Road name | Postcode
1 | alex road | sw2 4r
2 | alex road | sw2 4r
3 | alex road | sw1 2b
4 | alex road | sw2 4r
5 | alex road | sw2 4r
7 | brit road | bw2 4t
4 | brit road | bw2 4t
6 | brit road | bw2 4t
8 | brit road | bw2 4t
10 | brit road | bw2 4t

我需要一個ACCESS SQL查詢，該查詢可以按路名將所有記錄分組，總記錄可以超過20,000

我需要以下格式的輸出

Road Name | House Number | Postcode
--------------------------------------
alex road | 1,2,3,4,5 |  sw2 4r,sw1 2b
brit road | 7,4,6,8,10 | bw2 4t

Answer 1

正如有一天所指出的那樣，在SO的早期文章中，使用ADO會更容易，這里有一個示例

查詢樣例：

   SELECT d.DeptID, d.Department, 
          ConcatADO("SELECT FName & ' ' & SName, Address FROM Persons 
                     WHERE DeptID=" & [d].[DeptID],", "," : ") AS Who
   FROM Departments AS d INNER JOIN Persons AS p ON d.DeptID = p.DeptID
   GROUP BY d.DeptID, d.Department, 3;

使用ADO的功能

Function ConcatADO(strSQL As String, strColDelim, strRowDelim, ParamArray NameList() As Variant)
   Dim rs As New ADODB.Recordset
   Dim strList As String

   On Error GoTo Proc_Err

       If strSQL <> "" Then
           rs.Open strSQL, CurrentProject.Connection
           strList = rs.GetString(, , strColDelim, strRowDelim)
           strList = Mid(strList, 1, Len(strList) - Len(strRowDelim))
       Else
           strList = Join(NameList, strColDelim)
       End If

       ConcatADO = strList

   Exit Function

   Proc_Err:
       ConcatADO = "***" & UCase(Err.Description)
   End Function

Answer 2

因為在Access中沒有像group_concat這樣的函數。 所以我使用其內置的導入工具將csv文件導入到phpMyAdmin mysql數據庫中，並使用以下查詢對它們進行分組

SELECT  road,pcode, group_concat(house_number) 
FROM mytable
GROUP BY road, pcode

然后使用內置的導出工具phpmyadmin將其導出回csv。 我不知道是否有更好的方法可以做到這一點。