Display the user which is not friend of logged in user sql

I have tow SQL table with name ACCOUNTS and FRIENDS and

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• $member['id'] means id of users
• $client['id'] means id of user that is logged in

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I want to display the user which is not friend of logged in user I try this code but this give SQL error the code is

$isfriend = sql_counts(sql_query("SELECT * FROM `".tb(开发者_运维问答)."friends` WHERE uid={$member['id']} and fid={$client['id']}"));
$res = sql_query("select * from `".tb()."accounts` where !isfriend order by DESC limit 30");

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it's probably because sql_query nor sql_counts function is defined.

You should use

mysql_num_rows() and mysql_query()

*Sure this answer applies only if they are not your own functions