ajax insert 질문요

<?php
include_once("../../../common.php");
$output = '';

if(!empty($_POST)){
$AccountNumber = $_POST["AccountNumber"];
$AccountPWD = $_POST["AccountPWD"];
$BankCode = $_POST["BankCode"];
$AccountType = $_POST["AccountType"];
$IdentityNumber = $_POST["IdentityNumber"];
$BankID = $_POST["BankID"];
$FastID = $_POST["FastID"];
$FastPWD = $_POST["FastPWD"];


$sql = "insert `g5_account`
  set AccountName              = '$_POST[AccountName]', //이름
       AccountNumber                = '$_POST[AccountNumber]', // 계좌번호
       AccountPWD                 = '$_POST[AccountPWD]', //계좌비번
       BankCode              = '$_POST[BankCode]',  // 은행코드
       AccountType            = '$_POST[AccountType]',  //사업자구분
       IdentityNumber            = '$_POST[IdentityNumber]', //식별번호
       BankID           = '$_POST[BankID]', //국민 뱅크아이디
       FastID           = '$_POST[FastID]', // 빠른조회 아이디
       FastPWD           = '$_POST[FastPWD]', 빠른조회 비밀번호
       Memo     = '$_POST[Memo]', //메모
       mb_id              = '{$member['mb_id']}'";

$.ajax({
url:"insert.php",
method:"POST",
data:$('#insert_form').serialize(),
success:function(data){

$('#insert_form')[0].reset();
$('#add_data_Modal').modal('hide');
// window.location.reload();
$('#employee_table').html(data);