In this article, Naeem shows us how to go about creating a statistical view of data, in the form of a clustered bar chart, using PHP and MySQL. He provides a real-life scenario, along with accompanying code, to demonstrate how the job can be accomplished.
Statistical View of Data in a Clustered Bar Chart (Page 1 of 5 )
Statistical view of data in the shape of a clustered bar chart is somewhat similar to having to select between two attributes of a single entity. However, a real-life case scenario is far more complicated. As in most cases, the situation has a lot of entities strongly related with each other through E-R diagrams obeying the normalization rules. Moreover, in such cases, data is not only two-dimensional but, rather, it may be multi-dimensional.
Let's look at the following E-R diagram from which we have to present a statistical view (in the form of a clustered bar chart). How can we do this? This article is an attempt to explain the solution.
Prerequisites
You should have Apache web server with PHP and MySQL running. A fair amount of knowledge in PHP is also required. I have provided a zip archive of a demo along with this article.
PHP 
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Sample Chapter: PHP Pocket Reference
