It can be challenging to remember the details of all the SQL Join operations. A convenient way to do this is to use Venn diagrams shown below. For examples of SQL Joins, go here.
Commonly used SQL Join operations are:
An Android Cursor provides read-write access to a data set from an SQL Database. The Android Cursor interface is a bit of a naming paradigm misdirection. We normally think of a cursor as an indicator on our computer screen as to where we can type. And we usually think of the cursor as primarily moving horizontally. he Android Cursor is more complex than this and its cursor movement is primarily vertical, indicating rows in a matrix. You can think of a Cursor as providing access to an array of data.
The chart below from the video training course Learning Android App Programming provides some convenient visual cues to help understand and remember Android Cursor functionality.
Android Content Providers involve a lot of "moving parts." The chart below from the video training course Learning Android App Programming provides an overview of the classes, objects and methods involved.
The World Wide Web Consortium (W3C) has announced that a final recommendation for HTML 5.0 will be released in the 4th quarter of 2014. In spite of the "recommendation" terminology that W3C uses, this is official release of HTML5. This is a big deal and great news. Browser developers will have a firm definition of HTML5 they can use to bring their products up to a complete level of support for this latest version of HTML.
W3C has also defined the follow-on version, HTML 5.1, to be released in the 4th quarter of 2016. This release will include features that have been pushed out in order to get release 5.0 completed in 2014. Without this stragegy, W3C was looking at an indefinite specification development timeframe.
Browser developers are not waiting for 2014 to begin implementation of HTML5. You can use www.html5test.com to check the status of your browser to see which features are supported and www.caniuse.com for a summary of the status of support by all the major browsers.
When it comes to organizing data in an Object Oriented Program, there are lots of choices and decisions to make. It can at times be difficult to think through all the criteria for selecting and implementing the right data structure.
The decision table below can help work through the data design process.
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