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When should I use a composite index?
...olumn_A )
But it will not (at least not directly, maybe it can help partially if there are no better indices) help for queries that need
index( column_A, column_C )
Notice how column_B is missing.
In your original example, a composite index for two dimensions will mostly benefit queries that q...
'Incomplete final line' warning when trying to read a .csv file into R
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Are you really sure that you selected the .csv file and not the .xls file? I can only reproduce the error if I try to read in an .xls file. If I try to read in a .csv file or any other text file, it's impossible to recreate the error y...
How to deploy correctly when using Composer's develop / production switch?
...dependencies only while being in development, so the tools will not be installed in production (on the live server). This is (in theory) very handy for scripts that only make sense in development, like tests, fake-data-tools, debugger, etc.
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Why use jQuery on() instead of click()
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Because you might have a dynamically generated elements (for example coming from an AJAX call), you might want to have the same click handler that was previously bound to the same element selector, you then "delegate" the click event using on() with selecto...
Why does the indexing start with zero in 'C'?
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In C, the name of an array is essentially a pointer [but see the comments], a reference to a memory location, and so the expression array[n] refers to a memory location n elements away from the starting element. This means that the index is used as an offset. Th...
Visual C++: How to disable specific linker warnings?
... /wd4099 will not work), but what you can do instead is patch link.exe (usually C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\bin\link.exe) to remove it from said list . Sounds like a jackhammer, i know. It works though.
For instance, if you want to remove the warning for 4099, open link.e...
TDD vs. Unit testing [closed]
...n. Even Unit tests written after the code are better than no Unit Tests at all!
Once they're proficient at Unit Testing (and everything that comes with it), then you can work on getting them to create the tests first...and code second.
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Deploying website: 500 - Internal server error
..., because this is a general message without giving information on what's really happening for security reasons.
With the detailed error, you can locate the real issue here.
Also, if you can run the browser on the server, you get details on the error, because the server recognizes that you are loca...
Including a groovy script in another groovy
...ble quotes with your groovy script).
I do this with a class surprisingly called "Tools.groovy".
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Recursion in Angular directives
...are a couple of popular recursive angular directive Q&A's out there, which all come down to one of the following solutions:
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