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我有一个插入语句，其中我收到以下错误消息:
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 'WHERE ref = '6u5i14e'' at line 1
这是我的 php 文件:
<?php
$secret_question = mysql_real_escape_string($_REQUEST['secret_question']);
$secret_anwser = mysql_real_escape_string($_REQUEST['secret_anwser']);
$con = mysql_connect("localhost","*****","*****");
if (!$con)
{
die('Could not connect: ' . mysql_error());
}
mysql_select_db('*****', $con);
$sql="INSERT INTO public (secret_question, secret_anwser) VALUES ('$secret_question','$secret_answer') WHERE ref = '". $_SESSION['ref']."' ";
if (!mysql_query($sql,$con))
{
die('Error: ' . mysql_error());
}
else
{
echo '<hr><h3>Your Account Has Now Been Activated. <br/> <a href = "votenow.php">Please Login To Vote</a></h3><hr>';
}
?>
我做错了什么？