如何更改此查询？

Question

How do i change the SELECT query from this:

$tre = mysql_query("SELECT System_id, Full_name FROM accounts 
WHERE Full_name LIKE '". mysql_real_escape_string($_GET['q'])."%' LIMIT 5");

To having this query below in $tre:

SELECT DISTINCT contacts.friend_id, accounts.full_name, 
accounts.system_id
FROM contacts, accounts
WHERE (contacts.system_id = '$sid' AND contacts.friend_id 
= accounts.system_id) OR (contacts.friend_id = '$sid' 
AND contacts.system_id = accounts.system_id)

I want the to place the second query inside of $tre = mysql_query();

I am having trouble doing so because the second query has brackets in them and being new i am not sure how to do it correctly.

Answer 1

Also, the brackets do not affect the query. just place it inside the double quotations and PHP will know to send the whole query to MySQL.

Also: If $sid comes from any user input put something like this in place of $sid:

" . mysql_real_escape_string($sid) . "