insert null into Mysql DB

I am trying to insert "NULL" where form values are empty/blank so why doesnt this work, on retrieval I get "0" for cost, sell and expenses

<?php
$con = mysql_connect("localhost","root","");
if (!$con)
  {
  die('Could not connect: ' . mysql_error());
  }

mysql_select_db("CWCCARS", $con);
$cost=$_POST['cost'];
$expenses=$_POST['expenses'];
$sell=$_POST['sell'];
$cost = !empty($cost) ? "'$cost'" : "NULL";
$expenses = !empty($expenses) ? "'$expenses'" : "NULL";
$sell = !empty($sell) ? "'$sell'" : "NULL";
$sql="INSERT INTO cars (registration, carmake, carmodel, year, cost, expenses, sell, selldate, seller, workdone, comments)
VALUES
('$_POST[registration]','$_POST[carmake]','$_POST[carmodel]','$_POST[year]','$cost','$expenses','$sell','$_POST[selldate]','$_POST[seller]','$_POST[workdone]','$_POST[comments]')";
if (!mysql_query($sql,$con))
  {
  die('Error: ' . mysql_error());
  }
mysql_close();
?>
cookersAsked:
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Pratima PharandeConnect With a Mentor Commented:
try wih no single quotes while insert


$sql="INSERT INTO cars (registration, carmake, carmodel, year, cost, expenses, sell, selldate, seller, workdone, comments)
VALUES
('$_POST[registration]','$_POST[carmake]','$_POST[carmodel]','$_POST[year]',$cost,$expenses,$sell,'$_POST[selldate]','$_POST[seller]','$_POST[workdone]','$_POST[comments]')";
0
 
Loganathan NatarajanConnect With a Mentor LAMP DeveloperCommented:
remove single quote ,

try like this
$sql="INSERT INTO cars (registration, carmake, carmodel, year, cost, expenses, sell, selldate, seller, workdone, comments)
VALUES('$_POST[registration]','$_POST[carmake]','$_POST[carmodel]','$_POST[year]',$cost,$expenses,$sell,'$_POST[selldate]','$_POST[seller]','$_POST[workdone]','$_POST[comments]')";

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cookersAuthor Commented:
Thank you
0
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