Incorrect row ID returned in simple select query

Question

I am using Codeigntier to run the a query like this:

$query = $this->db->query("SELECT users.*, user_profiles.* FROM users, user_profiles WHERE " . "users.id = $user_id AND user_profiles.user_id = $user_id");
$row = $query->row();

I have placed an echo to get the last query $this->db->last_query() . Which shows:

SELECT users.*, user_profiles.* FROM users, user_profiles WHERE users.id = 6850 AND user_profiles.user_id = 6850

The result it returns is:

object(stdClass)[24]
  public 'id' => string '6849' (length=4)

The id the result shows is 6849 . I nearly fell of my chair! I ran the same query on my MySQL database and the id returned for that exact same query is 6850 . 6850 is the correct ID.

I have no idea how to debug this as this is the simplest of queries. Any help appreciated.

Answer 1

Explicitly select your columns, and AS *something* alias them. Then check the ID's.

It is likely that the id of the table user_profiles is being shown rather than the actual user id from the users table that you expect as you are not specifying the columns.