You can use my generic DJoin function for this having a line feed as the separator:
Dim dQry As String
Dim dupeItems As String
dQry = Me.cboUniqueName.Value
dupeItems = DJoin("Description", "[Duplicates Table]", "[Dupe Names] = '" & dQry & "'", vbCrLf)
Me.txtDescription.Value = dupeItems
The function (complete module):
Option Explicit
' Returns the joined (concatenated) values from a field of records having the same key.
' The joined values are stored in a collection which speeds up browsing a query or form
' as all joined values will be retrieved once only from the table or query.
' Null values and zero-length strings are ignored.
'
' If no values are found, Null is returned.
'
' The default separator of the joined values is a space.
' Optionally, any other separator can be specified.
'
' Syntax is held close to that of the native domain functions, DLookup, DCount, etc.
'
' Typical usage in a select query using a table (or query) as source:
'
' Select
' KeyField,
' DJoin("[ValueField]", "[Table]", "[KeyField] = " & [KeyField] & "") As Values
' From
' Table
' Group By
' KeyField
'
' The source can also be an SQL Select string:
'
' Select
' KeyField,
' DJoin("[ValueField]", "Select ValueField From SomeTable Order By SomeField", "[KeyField] = " & [KeyField] & "") As Values
' From
' Table
' Group By
' KeyField
'
' To clear the collection (cache), call DJoin with no arguments:
'
' DJoin
'
' Requires:
' CollectValues
'
' 2019-06-11, Cactus Data ApS, Gustav Brock
'
Public Function DJoin( _
Optional ByVal Expression As String, _
Optional ByVal Domain As String, _
Optional ByVal Criteria As String, _
Optional ByVal Delimiter As String = " ") _
As Variant
' Expected error codes to accept.
Const CannotAddKey As Long = 457
Const CannotReadKey As Long = 5
' SQL.
Const SqlMask As String = "Select {0} From {1} {2}"
Const SqlLead As String = "Select "
Const SubMask As String = "({0}) As T"
Const FilterMask As String = "Where {0}"
Static Values As New Collection
Dim Records As DAO.Recordset
Dim SubRecords As DAO.Recordset
Dim Sql As String
Dim SqlSub As String
Dim Filter As String
Dim Value As Variant
Dim Result As Variant
On Error GoTo Err_DJoin
If Expression = "" Then
' Erase the collection of keys.
Set Values = Nothing
Result = Null
Else
' Get the values.
' This will fail if the current criteria hasn't been added
' leaving Result empty.
Result = Values.Item(Criteria)
'
If IsEmpty(Result) Then
' The current criteria hasn't been added to the collection.
' Build SQL to lookup values.
If InStr(1, LTrim(Domain), SqlLead, vbTextCompare) = 1 Then
' Domain is an SQL expression.
SqlSub = Replace(SubMask, "{0}", Domain)
Else
' Domain is a table or query name.
SqlSub = Domain
End If
If Trim(Criteria) <> "" Then
' Build Where clause.
Filter = Replace(FilterMask, "{0}", Criteria)
End If
' Build final SQL.
Sql = Replace(Replace(Replace(SqlMask, "{0}", Expression), "{1}", SqlSub), "{2}", Filter)
' Look up the values to join.
Set Records = CurrentDb.OpenRecordset(Sql, dbOpenSnapshot)
CollectValues Records, Delimiter, Result
' Add the key and its joined values to the collection.
Values.Add Result, Criteria
End If
End If
' Return the joined values (or Null if none was found).
DJoin = Result
Exit_DJoin:
Exit Function
Err_DJoin:
Select Case Err
Case CannotAddKey
' Key is present, thus cannot be added again.
Resume Next
Case CannotReadKey
' Key is not present, thus cannot be read.
Resume Next
Case Else
' Some other error. Ignore.
Resume Exit_DJoin
End Select
End Function
' To be called from DJoin.
'
' Joins the content of the first field of a recordset to one string
' with a space as delimiter or an optional delimiter, returned by
' reference in parameter Result.
'
' 2019-06-11, Cactus Data ApS, Gustav Brock
'
Private Sub CollectValues( _
ByRef Records As DAO.Recordset, _
ByVal Delimiter As String, _
ByRef Result As Variant)
Dim SubRecords As DAO.Recordset
Dim Value As Variant
If Records.RecordCount > 0 Then
While Not Records.EOF
Value = Records.Fields(0).Value
If Records.Fields(0).IsComplex Then
' Multi-value field (or attachment field).
Set SubRecords = Records.Fields(0).Value
CollectValues SubRecords, Delimiter, Result
ElseIf Nz(Value) = "" Then
' Ignore Null values and zero-length strings.
ElseIf IsEmpty(Result) Then
' First value found.
Result = Value
Else
' Join subsequent values.
Result = Result & Delimiter & Value
End If
Records.MoveNext
Wend
Else
' No records found with the current criteria.
Result = Null
End If
Records.Close
End Sub
Full documentation and demo can be found here:
Join (concat) values from one field from a table or query
