...
        sql = "SELECT logID, if(isnull(projectLog.distance),'', if(" & _
          "projectLog.distance=0,'', projectLog.distance)) AS 'Entfernung' FROM" & _
          "projectLog "
        Try
            'Grid füllen
            Dim da As New MySqlDataAdapter(sql, conn)
            Dim ds As New DataSet
            da.Fill(ds)
            Dim dv As New DataView(ds.Tables(0))
            dgvData.DataSource = dv
        ...

        ...
        sql = "SELECT logID, projectLog.distance AS 'Entfernung' FROM" & _
          "projectLog "
        ...