Selecting data from one table based on data in another

[weemee500]

Hi, I am currently trying to make a part for my user driven website where one user can subscribe to another and whoever they have subscribed to is echoed back on there profile page.

my users table structure is: id username password and my subscription table is: id user_id follow_id

i am currently trying to query the logged in users subscriptions with this sql_query

$subsQuery = mysql_query("SELECT U.username FROM users AS U INNER JOIN subscription AS Sub.follow_id=U.id WHERE Sub.user_id=".$ID); $ID being the logged in users id.

However when trying to echo this on the page using this bit of php:

<? while ($subs = mysql_fetch_assoc($subsQuery)) { ?><br /><br />
<? echo $subs['username'] ?>

							<?  } ?>

it throws back this error:

Warning: mysql_fetch_assoc(): supplied argument is not a valid MySQL result resource in /home/avince/public_html/users/user.php on line 53

Any help would be much appreciated!

[Weedpacket]

[man]mysql_error[/man] will return MySQL's error message.

[_newbie]

Yip, your SQL is all messed up, you have a JOIN with no ON for a start, and it looks like you are trying to alias a table into a field. If you post your table structures we should be able to work it out. Looking at what it's trying to do, I don't think you will need aliases for your tables, but untill I know what's in each table I can't be certain.

[3_grosz]

You forgotten about semicolon. And your query is difficult to understand. This snippet include error "subscription AS Sub.follow_id=U.id".

<?
$subsQuery = mysql_query("SELECT U.username FROM users AS U INNER JOIN subscription AS Sub.follow_id=U.id WHERE Sub.user_id=".$ID);

//$ID being the logged in users id. 
//However when trying to echo this on the page using this bit of php:

while ($subs = mysql_fetch_assoc($subsQuery)) {
?><br /><br />
<? echo $subs['username'];
//you forgotten about semicolon
}
?>