为什么这个SELECT * FROM数据库不起作用？

include "connect.php";

$deck = addslashes($_GET['deck']);
$side = addslashes($_GET['side']);
$type = addslashes($_GET['type']);
$by = addslashes($_GET['creator']);
$name = addslashes($_GET['name']);

$table = "deck";

$result = mysql_query("SELECT * FROM $table WHERE name = '$name' AND by = '$by'");
if(!$result){
    $query2 = "INSERT INTO $table (deck, side, name, type, by) VALUES ('$deck', '$side', '$name', '$type', '$by')";
    $result2 = mysql_query($query2);
}

the insert into never gets inserted, my database is like

id int(11) autoincrement
deck varchar(900)
side varchar(900)
type varchar(900)
by varchar(900)
name varchar(900)

by is reserved keyword.

use like this

$result = mysql_query("SELECT * FROM $table WHERE name = '$name' AND `by` = '$by'");