Tutorial by Examples: r

UNION ALL to select all(duplicate values also) German cities from the "Customers" and "Suppliers" tables. Here Country="Germany" is to be specified in the where clause. Query: SELECT City, Country FROM Customers WHERE Country='Germany' UNION ALL SELECT City, Count...
Full width table cell background images <html xmlns:v="urn:schemas-microsoft-com:vml"> <head> <style> v:* { behavior: url(#default#VML); display: inline-block; } </style> </head> <body> <center> <...
Some email clients (notably Windows Desktop Outlook) collapse tables with no content, even if there are dimensions or padding. To prevent these clients from collapsing the spacer table, you can add an invisible   that serves as content. Then zero out the character's font-size and line-heig...
Using width or height tags to resize images in your markup can create a problem in Internet Explorer browsers. If your reader is viewing an email in-browser, and that email happens to have fluid images in it, they’ll look pretty ugly as they resize. Using -ms-interpolation-mode:bicubic; ensures that...
Detailed instructions on getting text set up or installed.
Create new patches with hg qnew patch-name and then update them with new changes with hg qrefresh: hg qnew myFirstPatch // Creates a new patch called "myFirstPatch" ... // Edit some files hg qrefresh // Updates "myFirstPatch" with changes hg qnew ...
To rebase with latest changesets in upstream repository: hg qpop -a // Pop all patches hg pull -u // Pull in changesets from upstream repo and update hg qpush -a // Push all patches on top of new changesets If there are any conflicts you will be forced to merge your patches.
Functional tests are best described as tests for your user stories. If you've dealt with user stories before they normally follow the following pattern: As a [role], I want to [desire], so that [benefit/desired outcome] For the following examples we'll use this user story as an example: As a Du...
If we want to test JavaScript on a website, we'll need to use something a bit more powerful than Goutte (which is just cURL via Guzzle). There are a couple of options such as ZombieJS, Selenium and Sahi. For this example I'll use Selenium. First you'll need to install the drivers for Mink: $ compo...
From documentation: The HttpContext.Items collection is the best location to store data that is only needed while processing a given request. Its contents are discarded after each request. It is best used as a means of communicating between components or middleware that operate at different poi...
The wheel collider inside unity is built upon Nvidia's PhysX wheel collider, and therefore shares many similar properties. Technically unity is a "unitless" program, but to make everything make sense, some standard units are required. Basic Properties Mass - the weight of the wheel in ...
Django 1.10 introduced a new middleware style where process_request and process_response are merged together. In this new style, a middleware is a callable that returns another callable. Well, actually the former is a middleware factory and the latter is the actual middleware. The middleware facto...
A global RegExp match can be performed using preg_match_all. preg_match_all returns all matching results in the subject string (in contrast to preg_match, which only returns the first one). The preg_match_all function returns the number of matches. Third parameter $matches will contain matches in f...
The predicate function matches can be used to evaluate strings on the fly without use of any object declarations. IF matches( val = 'Not a hex string' regex = '[0-9a-f]*' ). cl_demo_output=>display( 'This will not display' ). ELSEIF matches( val = '6c6f7665' reg...
As already pointed out in other pitfalls, catching all exceptions by using try { // Some code } catch (Exception) { // Some error handling } Comes with a lot of different problems. But one perticular problem is that it can lead to deadlocks as it breaks the interrupt system when writ...
The latest version of the Oracle Java style guide mandates that the "then" and "else" statements in an if statement should always be enclosed in "braces" or "curly brackets". Similar rules apply to the bodies of various loop statements. if (a) { //...
Solr is a standalone enterprise search server with a REST-like API. You put documents in it (called "indexing") via JSON, XML, CSV or binary over HTTP. You query it via HTTP GET and receive JSON, XML, CSV or binary results. Solr uses the Lucene search library and extends it. Here are som...
Create blank Multi-Device (Firemonkey) application. Drop Rectangle on Form. In Object inspector window (F11) find RotationAngle click on drop down button, and select "Create New TFloatAnimation". Object inspector window is automatically switched to a newly added TFloatAnimation, you...
Scaling to fit Means that the whole image will be visible but there may be some empty space on the sides or top and bottom if the image is not the same aspect as the canvas. The example shows the image scaled to fit. The blue on the sides is due to the fact that the image is not the same aspect as ...
Documenting your work Remember what you've done and retain long outputs which can't be kept in WinDbg's buffer. It's always good to have a log available for reproducing debugging steps, e.g. to ask questions on Stack Overflow. CommandPurpose.logopencreate a log file.logcloseclose the log file.dump...

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