unknown column 'email' in where clause - php

Question

I have problem with this code. It gives me 'Unknown column 'email' in where clause.
I tried almost everything, but I don't know what is the problem. I am beginner so please be gentle :)
Any ideas how to solve it?
Thanks a lot
session_start();
include('connect.php');
if(isset($_POST['submit']))
//when isn't username in form
if($_POST['firstname'] == '')
{
$_SESSION['error']['firstname'] = 'First name is required';
}
if($_POST['surname'] == '')
{
$_SESSION['error']['surname'] = 'Surname is required';
}
//when email isn't in form
if($_POST['email'] == '')
{
$_SESSION['error']['email'] = 'Email is required';
}
//check if is email in correct format
if(preg_match("/^([a-zA-Z0-9])+([a-zA-Z0-9._-])*#([a-zA-Z0-9_-])+([a-zA-Z0-9._-]+)+$/", $_POST['email']))
{
//email is in correct format and exist?
$email = $_POST['email'];
$sql1 = "SELECT * FROM users WHERE email = '$email'";
$result1 = mysqli_query($connect, $sql1) or die(mysqli_error($connect));
if(mysqli_num_rows($result1) > 0)
{
$_SESSION['error']['email'] = 'Email is already used';
}
}
else
//error for wrong format of email
{
$_SESSION['error']['email'] = 'Your email is in wrong format';
}
//when isn't password in form
if($_POST['password'] == '')
{
$_SESSION['error']['password'] = 'Password is required';
}
//when is error -> registration form
/*if(isset($_SESSION['error']))
{
header("Location: index.php");
exit();
}
else
*/
{
$firstname = mysqli_real_escape_string($connect,$_POST['firstname']);
$surname = mysqli_real_escape_string($connect,$_POST['surname']);
$email = $_POST['email'];
$password = mysqli_real_escape_string($connect,$_POST['password']);
$phone_number = mysqli_real_escape_string($connect,$_POST['phone_number']);
$note = mysqli_real_escape_string($connect,$_POST['note']);
$sql2 = "INSERT INTO users (firstname, surname, email, phone_number, note, password) VALUES ('$firstname', '$surname',
'$email', '$phone_number', '$note','$password')";
$result2 = mysqli_query($connect, $sql2) or die('Error: ' .mysqli_error($connect));

Answer 1

the column name email may be wrong or does not exist in the data base use the same column name as defined in the data base