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    <p>i have 3 tables, top_category, bottom_category, products, at the moment i have listed the top_category, i am confused about how to approach listing the second category but have it list so it knows what top_category it belongs too, this is why i have the foreign keys parent, so if the top_category for example is:</p> <pre><code>prod1 prod2 prod3 etc </code></pre> <p>and now i want to load my bottom category into these top_categories like this:</p> <pre><code>prod1 -subprod1 -subprod2 -subprod3 prod2 -subprod4 -subprod5 prod3 -subprod6 etc </code></pre> <p>This is my database:</p> <pre><code>CREATE TABLE top_category ( id INT PRIMARY KEY, NAME VARCHAR(100) ); CREATE TABLE bottom_category ( id INT PRIMARY KEY, NAME VARCHAR(100) , top_category_id INT REFERENCES top_category ); create table product ( id int primary key, name varchar(100) , bottom_category_id int references bottom_category ); </code></pre> <p>This is my php &amp; html code:</p> <pre><code>&lt;?php include('dbconnect.php'); try { $result = $pdo-&gt;query(" SELECT * FROM top_category ORDER BY top_name ASC; "); } // end try catch (PDOException $e) { echo 'There was a error fetching the products.' . $e-&gt;getMessage(); exit(); } // end catch $products = array(); foreach ($result as $row) { $products[] = array('id' =&gt; $row['id'], 'top_name' =&gt; $row['top_name']); } ?&gt; &lt;div class="sidebar"&gt; &lt;h4 class="sidebar-header"&gt;Select Products&lt;/h4&gt; &lt;form class="nav-search-form"&gt; &lt;input type="search" name="search" placeholder="Search products"&gt; &lt;/form&gt; &lt;nav class="sidebar-links"&gt; &lt;ul&gt; &lt;li&gt;&lt;a id="red" href="index.php"&gt;New Products&lt;/a&gt;&lt;/li&gt; &lt;?php foreach ($products as $product): ?&gt; &lt;li&gt;&lt;a href="#"&gt;&lt;?php echo htmlspecialchars($product['top_name']);?&gt;&lt;/a&gt; &lt;?php endforeach; ?&gt; &lt;ul&gt; &lt;li&gt;&lt;a href="#"&gt;&lt;/a&gt;&lt;/li&gt; &lt;/ul&gt; &lt;/li&gt; &lt;/ul&gt; &lt;/nav&gt; &lt;/div&gt;&lt;!-- sidebar --&gt; &lt;div class="main-content"&gt; </code></pre>
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