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PHP/MySQL Join Question


centenial

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Hello,

I have three MySQL tables:

1. table "listings" (fields below)
a. listing_number
b. agent_id
c. category_id

2. table "agents" (fields below)
a. id
b. name

3. table "categories" (fields below)
a. id
b. name

I want to display the information in one table, with these columns:
1. Listing Number
2. Agent
3. Category

I want to display the "Agent" and "category" names instead of the agent and category ids. Can this be done with a MySQL Join Query?

Thanks for your help,
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[code]<?php

// UNTESTED CODE

DEFINE ('DB_USER', 'username');
DEFINE ('DB_PASSWORD', 'password');
DEFINE ('DB_HOST', 'localhost');
DEFINE ('DB_NAME', 'sitename');

$dbc = @mysql_connect (DB_HOST, DB_USER, DB_PASSWORD) OR die ('Could not connect to MySQL: ' . mysql_error() );

@mysql_select_db (DB_NAME) OR die ('Could not select the database: ' . mysql_error() );

$query = "SELECT l.listing_number, a.agent, c.name FROM listings AS l, agents AS a, categories as c WHERE l.agent_id = a.id AND l.category_id = c.id;";
$result = @mysql_query($result);

while ($row = mysql_fetch_array($result,MYSQL_ASSOC)) {
  //DO SOMETHING WITH UR ROWS HERE
  //$row['agent'] for example
}

if($result) {
  //THE QUERY WAS SUCCESSFUL
} else {
  //IT WAS NOT SO SUCCESSFUL
}

?>
[/code]
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[code]include 'includes/config.php';
$sql = "select l.id, l.price, l.mls, a.name As agent, c.name As category, s.name As status from listings l
INNER JOIN agents a ON a.id = l.a_id
INNER JOIN categories c ON c.id = l.c_id
INNER JOIN status s ON s.id = l.status";
$res = mysql_query($sql,$conn) or die(mysql_error());

while ($row = mysql_fetch_assoc($res)) {
echo " <tr><td>";
print $row['mls'].'</td><td>'.
$row['category'].'</td><td>'.
$row['price'].'</td><td>'.
$row['agent'].'</td><td>'.
$row['status'].'</td><td><a href="listing.php?method=edit&id='.
$row['id'].'">Edit</a> <a href="listing.php?method=delete&id='.
$row['id'].'">Delete</a></td></tr>';

echo '</table>';[/code]

Why is this not working? Can someone please help?
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Sorry, I should have been more specific - It's working now. I do have one other question - I want to be able to sort by users clicking on a column.

Could someone tell me why this isn't working? I have the correct $GET variables - Is it a problem with the SQL query?

[code]select l.id, l.mls, a.name As agent, c.name As category, t.name As town, s.name As status from listings l
INNER JOIN agents a ON a.id = l.a_id
INNER JOIN categories c ON c.id = l.c_id
INNER JOIN towns t ON t.id = l.t_id
INNER JOIN status s ON s.id = l.status
ORDER BY $orderby // Which I get via the URL[/code]
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