Problem in PHP User Login

[balaram]

<?php

if(isset($REQUEST["feno"]))
{
require_once("connect.php");
$rows=mysql_query("select * from users where eno='$REQUEST[feno]';", $con);
$c=mysql_num_rows($rows);
if(!$c)
echo 'No Record Found ! <br/>';
}

?>

But here the problem is in mysql_num_rows.

It showing the error as " mysql_num_rows(): supplied argument is not a valid MySQL result resource ".

Please Anybody Help Me.

[sneakyimp]

Sounds like your query failed. You should never do mysql_query without checking to see if the result is valid. Try something like

mysql_query("select * from users where eno='$_REQUEST[feno]';", $con)
  or die('query failed:' . mysql_error($con));

[Judgey92]

sneakyimp is right, always check of the query is valid. If your still stuck make sure the row and column names are correct.