Question

I have made an SQL query from two tables. Everything works good but problem is that this two tables have the same field names and after I do not know how to display them correct, how to tell that $data[‘aaa’] is from table 1 and the same $data[‘aaa’] from table 2

here is my SQL query :

    $query_str = "SELECT 
                    cm.id,
                    cm.global_category_id,
                    cm.num,
                    cm.menu_lv,
                    cm.menu_ru,
                    cm.menu_en,
                    u.id,
                    u.menu_lv,
                    u.menu_ru,
                    u.menu_en
                    FROM products_category cm, products_global_category u
                    WHERE cm.global_category_id = u.id
                    ";

and display data

<? foreach ($sub_category_list as $line) : ?>
<tr>
   <td><?=$line['menu_lv']?></td>   <---- here I want to display data from products_global_category u       
   <td><?=$line['sub_menu_lv']?></td>   <---- products_category cm
   <td><?=$line['sub_menu_ru']?></td>   <---- products_category cm
   <td><?=$line['sub_menu_en']?></td>   <---- products_category cm
</tr>
<? endforeach; ?>

Answer 1

As a solution you can change your SQL query to give an alias to the fields that have the same name.

For example:

SELECT somefield AS othername FROM table.

In this case, the somefield field will be available through the alias othername.

In your case:

$query_str = "SELECT 
                cm.id AS cm_id,
                cm.global_category_id,
                cm.num,
                cm.menu_lv AS cm_menulv,
                cm.menu_ru AS cm_menuru,
                cm.menu_en AS cm.menuen,
                u.id as u_id,
                u.menu_lv AS u_menulv,
                u.menu_ru AS u_menuru,
                u.menu_en AS u_menuen
                FROM products_category cm, products_global_category u
                WHERE cm.global_category_id = u.id
                ";

And then in your PHP:

$line['u_menulv'] //Access field menu_lv from products_global_category table
$line['cm_menulv'] //Access field menu_lv from products_category table

EDIT: In mysql_fetch_array documentation page:

If two or more columns of the result have the same field names, the
last column will take precedence. To access the other column(s) of the
same name, you must use the numeric index of the column or make an
alias for the column. For aliased columns, you cannot access the
contents with the original column name.

In other words, either create an alias like shown above or access the fields by the numeric index of the array.