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2644 - Counting rows in joined MySQL tables
Yesterday, I showed you how to join two database tables and get out all matching records, and records which are "orphans" too - records in the left hand table that don't match anything in the right hand table, and vice versa. Yesterday's archive is [here] and our long standing tutorial on joins whi ....

2643 - Relating tables with joins in MySQL
Relational Databases are stores of data in which that data can be matched using common characteristics. For example, I have a table of data about programming languages (which includes a columns for the name of the language and the author) and another table of data about our courses which includes th ....

2642 - What does a web application look like under Tomcat?
When you're deploying a Java application on your web server, you're likely to be using a container engine such as Tomcat ([learn about tomcat]). If you're not the author of the application, it will probably come to you in a file with a .war extension - a Web ARchive file. A .war file contains load ....

2641 - Object Oriented Programming in PHP
New ... for the first time ever ... our Object Oriented PHP Programming training course is running on a Monday. That's Monday, 26th April 2010. It then revert to Friday - its more normal day of the week - in May. PHP's roots were not object oriented ... and in the early days of it being used for ....

2640 - How is your tax pound spent?
Where does the UK Government Spend your Money? What proportion goes on Defence, on Pensions, or Foreign Aid, on Economic Development, and on Health? Is the same amount spent for each person in the South West as in London and in Scotland? If you can answer these questions I'll be very impressed . ....

2639 - su or su - ... what is the difference?
If you're wanting to do admin work on a Unix or Linux system, you'll probably need to be logged in as the administrator. However, you're likely to find that you're not allowed to log in as root directly, and that you have to use the su command. Strictly speaking, "su" stands for "Substitute User" ....

2638 - Finding what has changed - Linux / Unix
If you want to find out what has changed in a file, use the diff command. And if you want to find out what has changed across a whole directory structure, use diff -r If I want to compare a backup with my current system - to see what has been altered (perhaps when something has gone wrong and I wa ....

2637 - Courses - Melksham and elsewhere - until the end of April
I'm usually well scheduled a few days ahead, but as I look further ahead, things are less certain. Extra private courses are booked, "options weeks" resolve into a decision as to which course we'll be running, and occasionally courses are switched around / added to in order to meet delegate's requi ....

2636 - Linux - useful tips including history and file name completion
Linux is feature rich - it's so feature rich that it's daunting to know where to start when teaching about it - what features to include and what to leave out. It's twenty to nine at night, and I'm still hear in "The Wilts" training room, just getting down to "the Mouth" which I would have expected ....

2635 - A PHP example that lets your users edit content without HTML knowledge
Scenario one. I need a "todo" list page for our web site which I, and the rest of our team, can view and update quickly and easily. Scenario two. Dave wants to provide his local cricket club's website with pages that the committee can update without them having to be trained / skilled in HTML, wit ....

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