ติด Error : You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 1 ครับ ช่วยหน่อยครับ

<?php
    $sql     = "select * from datalist where id=$id";
    $query = mysql_query($sql)or die(mysql_error());
    $row    = mysql_fetch_array($query);
    
    $email1 = $row['email1'];
    $email2 = $row['email2'];
	
    echo  'From'.$email1."</br>";
    echo  'To'.$email2."</br>"; 
?>