在ID上加入2个表可以正常工作，但现在我想回显另一个表的ID

I have 2 tables that have been joined using the ID that correlates the data on both tables. I output the information perfectly.

I output ID and it returns that of the ID column in table_1 - PERFECT. But now I want to output the ID column in table_2 within the same statement.

How do I now say ID from table_2, not table_1?

Here's some code...

$who = $_SESSION['who'];

$data = mysql_query("SELECT * FROM tbl_messages INNER JOIN tbl_users ON     tbl_messages.from_user = tbl_users.id WHERE tbl_messages.to_user = $who")

 or die(mysql_error()); 

 while($info = mysql_fetch_array( $data )) 
 { 
 echo "From:" . $info['id'];
 echo "to:" . $info['id'];
 } 

one good way to do this is to say

SELECT tbl_messages.id as msgID, tbl_users.id as usrID, * FROM tbl_messages INNER JOIN tbl_users ON     tbl_messages.from_user = tbl_users.id WHERE tbl_messages.to_user = $who

Then you will reference the fields with that name

echo "From:" . $info['msgID'];
 echo "to:" . $info['usrID'];