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SQL query not working in PHP

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[code]
<?php
setcookie("user","",0,"/","www.usnet1.net",0);
?>
<html>
<head>
<title>Log-in</title>
</head>

<body bgcolor="default">
<?php
$cn=@mysql_connect("localhost","username","password") or die(mysql_error());
@mysql_select_db("database name",$cn);
$sql="SELECT password FROM $_POST[username]";
$result=@mysql_query($sql,$cn) or die(mysql_error());
if($result!=$_POST[password])
{
echo $result;
die("Incorrect password!");
}
else
{
$_COOKIE[user]=$_POST[username];
echo "Welcome";
echo "<a href=\"panel.php\">Control panel</a>";
}
?>

</body>
</html>
[/code]

When i run this script it gives: Resource id #2Incorrect password!
what's wrong?

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as it says in the manual, mysql_query() returns a resource ID for the results of the query.  in order to extract the results, you need to use a grabbing function such as mysql_fetch_row(), mysql_fetch_array(), or mysql_result().

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[quote]$sql="SELECT password FROM $_POST[username]";[/quote]

Do you really have table for each user, each table having a record containing the password?

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