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Which are more performant, CTE or temporary tables?
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I'd say they are different concepts but not too different to say "chalk and cheese".
A temp table is good for re-use or to perform multiple processing passes on a set of data.
A CTE can be used either to recurse or to simply improved readability.
And, like a view or inline table valued functio...
What does enumerable mean?
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An enumerable property is one that can be included in and visited during for..in loops (or a similar iteration of properties, like Object.keys()).
If a property isn't identified as enumerable, the loop will ignore that it's within the object.
var obj = { key: 'val' };
console...
What is better: @SuppressLint or @TargetApi?
I have issues in my app regarding StrictMode and added the code snippet that basically disables the StrictModeHelper . However, Lint complains about setThreadPolicy() now and proposes to either add
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How to generate keyboard events in Python?
...(1, ctypes.byref(x), ctypes.sizeof(x))
def AltTab():
"""Press Alt+Tab and hold Alt key for 2 seconds
in order to see the overlay.
"""
PressKey(VK_MENU) # Alt
PressKey(VK_TAB) # Tab
ReleaseKey(VK_TAB) # Tab~
time.sleep(2)
ReleaseKey(VK_MENU) # Alt~
if __name__ ...
Configuring Git over SSH to login once
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Try ssh-add, you need ssh-agent to be running and holding your private key
(Ok, responding to the updated question, you first run ssh-keygen to generate a public and private key as Jefromi explained. You put the public key on the server. You should use a passphrase, if ...
Convert duration to hours:minutes:seconds (or similar) in Rails 3 or Ruby
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Also, if you want this to be very specific and not "round" the duration, check out Radar's gem: github.com/radar/distance_of_time_in_words. Drop-in replacement for distance_of_time_in_words and you can get the rounded number by passing vague: true as an option.
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Why does ~True result in -2?
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int(True) is 1.
1 is:
00000001
and ~1 is:
11111110
Which is -2 in Two's complement1
1 Flip all the bits, add 1 to the resulting number and interpret the result as a binary representation of the magnitude and add a negative sign (since the number begins...
How is this fibonacci-function memoized?
...mechanism in Haskell is by-need: when a value is needed, it is calculated, and kept ready in case it is asked for again. If we define some list, xs=[0..] and later ask for its 100th element, xs!!99, the 100th slot in the list gets "fleshed out", holding the number 99 now, ready for next access.
Th...
Logging best practices [closed]
I'd like to get stories on how people are handling tracing and logging in real applications. Here are some questions that might help to explain your answer.
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How can I correctly prefix a word with “a” and “an”?
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Download Wikipedia
Unzip it and write a quick filter program that spits out only article text (the download is generally in XML format, along with non-article metadata too).
Find all instances of a(n).... and make an index on the following word and all ...