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POOptimizing MySQL/PHP queries
 

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    <p>My database looks something like this:</p> <pre><code>[foods] foods_id, foods_name, groups_id, producers_id [producers] producers_id, producers_name [groups] groups_id, groups_name </code></pre> <p>PHP:</p> <pre class="lang-php prettyprint-override"><code>&lt;?php $producers = mysql_query('SELECT p.producers_name,p.producers_id FROM foods as f,producers as p WHERE p.producers_id = f.producers_id AND f.groups_id = 1 GROUP BY p.producers_name'); //list the producer... while($row = mysql_fetch_array($producers, MYSQL_ASSOC)){ $foods = mysql_query('SELECT foods_id, foods_name FROM foods WHERE producers_id = '.$row['producers_id'].' ORDER BY foods_name ASC'); while($row2 = mysql_fetch_array($foods, MYSQL_ASSOC)){ //list the foods under this producer... } } ?&gt; </code></pre> <p>GOAL:</p> <pre><code>PRODUCER A FOOD A FOOD B FOOD C PRODUCER B FOOD D FOOD E PRODUCER C FOOD F ... </code></pre> <p>SOLUTION: </p> <pre><code>&lt;?php $res = mysql_query('SELECT f.foods_id, f.foods_name, p.producers_id, p.producers_name FROM foods f, producers p WHERE p.producers_id = f.producers_id AND f.groups_id = '.$_GET['g'].' ORDER BY p.producers_name ASC, f.foods_name ASC'); $xproducers = array(); while($row = mysql_fetch_array($res , MYSQL_ASSOC)){ if(!array_key_exists($row['producers_id'],$xproducers)){ $xproducers[$row['producers_id']] = array('id'=&gt;$row['producers_id'],'name'=&gt;$row['producers_name'],'foods'=&gt;array()); } array_push($xproducers[$row['producers_id']]['foods'],array('id'=&gt;$row['foods_id'],'name'=&gt;$row['foods_name'])); } ?&gt; </code></pre> <p>This solution is fast enough for me, maybe its not perfect but it does the job fine :) I thank you all for your awesome help!</p> <p>Cheers</p>
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    1. COPlease stop writing new code with the ancient `mysql_*` functions. They are no longer maintained and community has begun the [deprecation process](http://goo.gl/KJveJ) . Instead you should learn about [prepared statements](http://goo.gl/vn8zQ) and use either [PDO](http://php.net/pdo) or [MySQLi](http://php.net/mysqli). If you cannot decide, [this article](http://goo.gl/3gqF9) will help to choose. If you care to learn, [here is a quite good PDO-related tutorial](http://goo.gl/vFWnC).
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    2. COhave you tried a JOIN? http://dev.mysql.com/doc/refman/5.0/en/join.html
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