Empty Results from Date invoice

if(!empty($_POST['sdate'])){

$query    = "SELECT l.AddressCode,
            l.owner,
            l.City,
            l.State,
            l.Zip,
            i.RefNumber,
            i.memo,
            i.Txndate,
            i.DueDate,
            i.ItemCustomerFullName,
            i.PO_number ,
            i.ItemAmount,
            i.PO_number,
            i.preorder_,
            i.Quantity,
            i.Vendor,
            i.balance
            FROM imw_locations l
            INNER JOIN vzw_invoice i
            ON l.AddressCode=i.ItemCustomerFullName
            WHERE l.owner='" . $owner . " '
            AND Txndate BETWEEN '".$sdate."' AND '".$edate."'

    ";

}

if(empty($_POST['sdate'])){
     $query    = "SELECT l.AddressCode,
            l.owner,
            l.City,
            l.State,
            l.Zip,
            i.RefNumber,
            i.memo,
            i.Txndate,
            i.DueDate,
            i.ItemCustomerFullName,
            i.PO_number ,
            i.ItemAmount,
            i.PO_number,
            i.preorder_,
            i.Quantity,
            i.Vendor,
            i.balance
            FROM imw_locations l
            INNER JOIN vzw_invoice i
            ON l.AddressCode=i.ItemCustomerFullName
            WHERE l.owner='" . $owner . " '


    ";
}