Hvordan tilføjer man en beskrivelse til sine felter

as far as I know you cant.

The Description property a built-in properties for a field and therefore cant be done in SQL but it might be possible in VBA code.

The Description property doesn't exist until you actually assign a
description. If you try to access the description property for a table that
doesn't have a description, it'll raise an error (3270: Property Not Found)

Public Function funcListDescription()
On Error GoTo ErrorPoint

    Dim db As DAO.Database
    Dim tdf As DAO.TableDef
    Dim fld As Field

    Set db = CurrentDb
    Set tdf = db.TableDefs("YourTableNameHere")
    For Each fld In tdf.Fields
        Debug.Print fld.Properties("Description")
    Next fld

ExitPoint:
    db.Close
    Set db = Nothing
    Exit Function

ErrorPoint:
    If Err.Number = 3270 Then
        Resume Next
    Else
        MsgBox "The following error has occurred:" _
        & vbNewLine & "Error Number: " & Err.Number _
        & vbNewLine & "Error Description: " & Err.Description _
        , vbExclamation, "Unexpected Error"
    End If
    Resume ExitPoint

End Function