SQL Variables

In SQL how can values be assigned to variables for example

Code:

---

Select firstname, lastname from users where email like 'john@example.com'

--assign firstname and lastname to variables

Update SomeNameAssociation
set firstnameis = @Fname
where lastname = @Lname

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Code:

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$get_list = "SELECT firstname, lastname FROM users WHERE email LIKE '%john@example.com%'";
$get_list_res = mysql_query($get_list,$conn) or die(mysql_error());
  while ($list_info = mysql_fetch_array($get_list_res)) {
      $firstname = $list_info['firstname'];
      $lastname = $list_info['lastname'];
}

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This only answers the question you asked. I am guessing you know how to update your other table now that the values pulled from the first table in your database.