Posts Tagged ‘databases’

SQL Courses And Training

Wednesday, August 18th, 2010

IT professionals nowadays are expected to have knowledge about various technologies, and one of the most important ones is SQL and RDBMS. SQL is short for Structured Query Language and is a programming language used to retrieve, save and delete data from relational databases. Learning SQL has become increasingly popular amongst IT professionals, as relational databases play pivotal role in information management. Find out how to learn SQL with our short guide below.

One of the obvious choices you have to learn SQL is to take an official SQL course from one of the major software RDBMS vendors. If you pass the exam at the end of the SQL course you will get official SQL certification, which can help you find a better position if you are looking for a job.

Your second choice is to finish a course by independent IT companies offering educational IT courses. Although these SQL courses usually come with a hefty price tag, they might be quite helpful. Some of these companies even offer their own certification programs.

Although having official SQL certification is nice, this doesn’t mean that this is the only way to learn SQL. There are many quality SQL books that can help you get up to speed with the language. If you decide to buy a SQL book and learn by yourself, then do some research online and choose a book that has great reviews.

All the SQL learning options we listed above are paid, however you can learn SQL for free by using one of the many online SQL resources. There are 1’000s of websites offering free online SQL tutorials and some of them even offer discussion forums, where you can get SQL help when you need it.

SQL is both ISO and ANSI standard, however many companies producing RDBMS software have made their own SQL extensions. For example Oracle has Pl/SQL, while Microsoft has Transact SQL. Despite the fact that there are many SQL dialects, the important thing is to learn the SQL concepts and you’ll be able to work with any proprietary SQL extension.

Having SQL knowledge will help you in your work and will make you more valuable to your employer. Any of the SQL training options above can help you learn the language. What counts is your understanding of the language and your experience, so don’t waste another minute and start learning SQL now!

IT professionals can learn SQL by visiting http://www.sqltraining.org and reading the SQL articles published there.

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The Basics of Multimedia F658DVD

Wednesday, March 17th, 2010

The Basics Of Multimedia

Telly Awards, Bronze Statue

Multimedia brings together graphics, animation, audio, video and text to create a new kind of experience. The results turn passive viewers into involved participants, opening up new possibilities for education, art and entertainment. This entertaining program examines the basic ingredients of multimedia, including hardware, software, scripting, interactivity and even robotics. Included are interviews with industry experts and examples of widely varied multimedia presentations from interactive databases and living books to virtual reality experiences.

“Timely and relevant.” Dr. Lionel S. Duncan, Morgan State University.

20 min.

Duration : 0:3:21

(more…)

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The Beginnings Of Architecture

Friday, November 27th, 2009

When you are on the web, you usually do a whole bunch of things. Some of these include submitting forms, doing searches and clicking on links. You may not realize it but all of these activities involve use of resources that are usually contained in a web server. Even a simple retrieving of a home page requires that the web browser that you are using request it from a web browser.

Generally, these types of requests where a web browser requests for a resource and the web server responds with it is called a two-tier architecture. This is a simple request-response action since there is no sophisticated storage software involved. However, there comes a time when complicated operations that involve dynamic data will be undertaken. In such cases, a separate database to handle these requests will be used.

When a web browser requests a resource and the server response is generated from a database, such an architecture is called a three-tier architecture. Whenever access database requests are made, the web browser must first communicate with the server which in turn, communicates with the database management system that retrieves the requested data. The database management system is used to manage all the data that is created, modified, queried or deleted by users.

Whenever you access database information, you will need to have your web server process your requests that are implemented using scripts. This organization allows access database requests from thousands of users to be done simultaneously. For efficiency, many websites implement the web server and the database server on separate machines. In more advanced and high-end applications the load is further distributed by use of many machines.

The web today allows the use of the HTTP protocol to access database information. HTTP is conceptually simple. A request made in HTTP receives a response from the web server. The response is usually a HTML document, an image or a program output that is sent back to the web browser. When you access database servers, you will usually be either requesting from entry information that is cataloged or you will be making changes to the entries themselves. Despite their seemingly complex nature, database management systems offer users application interfaces to do that. It is usually not necessary to make internal configurations to the database server. In most cases, this will be done right on the web browser. So when you access database information the next time you are on the web, you may likely be doing that via a number of machines. Quite amazing, is it not?

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