Access裡自訂類似MySQL group_concat 的函數

MySQL裡的group_concat很方便，MS-Access裡沒有。網上找到一個：http://access.mvps.org/access/modules/mdl0008.htm

Concatenate fields in same table Author(s) Dev Ashish   (Q)    I need to concatenate a field in the format "Value1; Value2; Value3" etc. for each unique value of another field in the same table.  How can I do this?(A)    Using the fConcatFld function,  in the Northwind database, the following query should return a concatenated list of all CustomerIDs if you group by ContactTitle. SELECT ContactTitle, fConcatFld("Customers","ContactTitle","CustomerID","string",[ContactTitle]) AS Customers FROM Customers GROUP BY ContactTitle;'************ Code Start **********'This code was originally written by Dev Ashish'It is not to be altered or distributed,'except as part of an application.'You are free to use it in any application,'provided the copyright notice is left unchanged.''Code Courtesy of'Dev Ashish'Function fConcatFld(stTable As String, _                    stForFld As String, _                    stFldToConcat As String, _                    stForFldType As String, _                    vForFldVal As Variant) _                    As String'Returns mutiple field values for each unique value'of another field in a single table'in a semi-colon separated format.''Usage Examples:'   ?fConcatFld(("Customers","ContactTitle","CustomerID", _'                "string","Owner")'Where  Customers     = The parent Table'       ContactTitle  = The field whose values to use for lookups'       CustomerID    = Field name to concatenate'       string        = DataType of ContactTitle field'       Owner         = Value on which to return concatenated CustomerID'Dim lodb As Database, lors As RecordsetDim lovConcat As Variant, loCriteria As StringDim loSQL As StringConst cQ = """"    On Error GoTo Err_fConcatFld        lovConcat = Null    Set lodb = CurrentDb        loSQL = "SELECT [" & stFldToConcat & "] FROM ["    loSQL = loSQL & stTable & "] WHERE "        Select Case stForFldType        Case "String":            loSQL = loSQL & "[" & stForFld & "] =" & cQ & vForFldVal & cQ        Case "Long", "Integer", "Double":    'AutoNumber is Type Long            loSQL = loSQL & "[" & stForFld & "] = " & vForFldVal        Case Else            GoTo Err_fConcatFld    End Select        Set lors = lodb.OpenRecordset(loSQL, dbOpenSnapshot)        'Are we sure that duplicates exist in stFldToConcat    With lors        If .RecordCount <> 0 Then            'start concatenating records            Do While Not .EOF                lovConcat = lovConcat & lors(stFldToConcat) & "; "                .MoveNext            Loop        Else            GoTo Exit_fConcatFld        End If    End With            'That's it... you should have a concatenated string now    'Just Trim the trailing ;    fConcatFld = Left(lovConcat, Len(lovConcat) - 2)Exit_fConcatFld:    Set lors = Nothing: Set lodb = Nothing    Exit FunctionErr_fConcatFld:    MsgBox "Error#: " & Err.Number & vbCrLf & Err.Description    Resume Exit_fConcatFldEnd Function'************ Code End **********