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For 2021 - online Python 3 training - see ((here)).

Our plans were to retire in summer 2020 and see the world, but Coronavirus has lead us into a lot of lockdown programming in Python 3 and PHP 7.
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Showing Joined tables on a web page
Using MySQL Databases in PHP Pages example from a Well House Consultants training course
More on Using MySQL Databases in PHP Pages [link]

This example is described in the following article(s):
   • Relating tables with joins in MySQL - [link]

If you're searching for a page where you can try this code, select here

This example references the following resources:
http://www.wellho.net/resources/ex.php4?item=s157/seeder
http://www.wellho.net/resources/ex.php4?item=h113/mysql_joins.php
http://www.wellho.net/mouth/158_MySQL-LEFT-JOIN-and-RIGHT-JOIN-INNER-JOIN-and-OUTER-JOIN.html
http://www.wellho.net/mqfull.html
http://www.wellho.net/course/php.html

Source code: mysql_joins.php Module: H113
<?php

mysql_connect
("127.0.0.1","delegate","k645pfb");
mysql_select_db("class");

$rs mysql_query("(select * from dm_subjects left join dm_courses ".
        
" on su_id = co_su) union ".
        
"(select * from dm_subjects right join dm_courses ".
        
"on su_id = co_su where su_id is NULL) ".
        
"order by su_name desc, co_key");

$table "";
while (
$row mysql_fetch_assoc($rs)) {
        
# First row - add headers
        
if ($table == "") {
                
$table .= "<tr>";
                foreach (
array_keys($row) as $column) {
                        
$table .= "<th>$column</th>";
                }
                
$table .= "</tr>";
        }
        
$table .= "<tr>";
        foreach (
array_keys($row) as $column) {
                
$showval htmlspecialchars($row[$column]);
                if (
$row[$column] === "") {
                        
$showval "-&nbsp;-";
                } else if (
$row[$column] === null) {
                        
$showval "[null]";
                }
                
$table .= "<td>$showval</td>";
        }
        
$table .= "</tr>";
}
?>
<html>
<head>
<title>Joining Demo - MySQL</title>
</head>
<body>
<h1>Demonstration of table joins</h1>
This is a demonstration of database tables that are joined together to
make a single web page ... our sample data comprises a table of programming
languages (with information about each of them) and a table of courses (with
some information about each of them). It is undesirable to repeat information
in a table, which is why this structure was selected - however, we do need to
connect up (and repeat) the data for the final presentation.<br><br>
&bull; Source of the MySQL to set up this demonstration - see
<a href=http://www.wellho.net/resources/ex.php4?item=s157/seeder
target=aside>here</a><br>
&bull; Source of the PHP for this page - see
<a href=http://www.wellho.net/resources/ex.php4?item=h113/mysql_joins.php
target=aside>here</a><br><br>
&bull; There's an overview of joins (and a comparison of the various sorts) <a
href=http://www.wellho.net/mouth/158_MySQL-LEFT-JOIN-and-RIGHT-JOIN-INNER-JOIN-and-OUTER-JOIN.html
target=aside>here</a><br>
&bull; Our MySQL courses are described <a href=http://www.wellho.net/mqfull.html
target=aside>here</a>
and our PHP courses <a href=http://www.wellho.net/course/php.html
target=aside>here</a>
<br><br>
<table border=1 cellpadding=3><?= $table ?></table>
</body>
</html>

Learn about this subject
This module and example are covered on the following public courses:
 * Learning to program in PHP
 * PHP Programming
 * MySQL
 * PHP Programming
 * Learning to program in PHP
Also available on on site courses for larger groups

Books covering this topic
Yes. We have over 700 books in our library. Books covering PHP are listed here and when you've selected a relevant book we'll link you on to Amazon to order.

Other Examples
This example comes from our "Using MySQL Databases in PHP Pages" training module. You'll find a description of the topic and some other closely related examples on the "Using MySQL Databases in PHP Pages" module index page.

Full description of the source code
You can learn more about this example on the training courses listed on this page, on which you'll be given a full set of training notes.

Many other training modules are available for download (for limited use) from our download centre under an Open Training Notes License.

Other resources
• Our Solutions centre provides a number of longer technical articles.
• Our Opentalk forum archive provides a question and answer centre.
The Horse's mouth provides a daily tip or thought.
• Further resources are available via the resources centre.
• All of these resources can be searched through through our search engine
• And there's a global index here.

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This web site is written and maintained by Well House Consultants.

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This is a sample program, class demonstration or answer from a training course. It's main purpose is to provide an after-course service to customers who have attended our public private or on site courses, but the examples are made generally available under conditions described below.

Conditions of use
Past attendees on our training courses are welcome to use individual examples in the course of their programming, but must check the examples they use to ensure that they are suitable for their job. Remember that some of our examples show you how not to do things - check in your notes. Well House Consultants take no responsibility for the suitability of these example programs to customer's needs.

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