unknown column field list解决方案

unknown column field list

PHP code

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if (empty($username)) {$error[]='Username cannot be empty.';}
$query='select user_name from user where user_name="' . $username . '"';
$result=mysql_query($query) or die(mysql_error($db));
if (mysql_num_rows($result)>0) {$error[]='Username has already been used.'; $username='';}

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