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What should every developer know about databases? [closed]
...amming is relatively small.
The third thing developers need to learn, at least in an overview, is data modeling, including conceptual data modeling, logical data modeling, and physical data modeling.
Conceptual data modeling is really requirements analysis from a data centric point of view.
Logi...
How do I run two commands in one line in Windows CMD?
...es back to Windows XP, Windows 2000, and some earlier NT versions. (4.0 at least, according to one commenter here.)
There are quite a few other points about this that you'll find scrolling down this page.
Historical data follows, for those who may find it educational.
Prior to that, the &&...
Ruby, !! operator (a/k/a the double-bang) [duplicate]
...understand why languages like Ruby are embracing it. Everything to use the least number of characters possible?
– Kevin M
Jan 5 '16 at 21:32
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How to check if NSString begins with a certain character
.... The performance of CFStringHasPrefix() seems to be 2-3 times better (at least when using my data set). So if you are using it in a performance sensitive area, you might want to try CFStringHasPrefix() instead.
– John Bowers
Feb 6 '14 at 21:00
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MySQL OPTIMIZE all tables?
... would you recommend this command to be scheduled to run at least once a month?
– Gaia
Oct 9 '12 at 19:35
11
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Logging best practices [closed]
...eaded environment (which is pretty much anything these days).
You need at least to set the ActivityId once for each logical operation in order to correlate.
Start/Stop and the LogicalOperationStack can then be used for simple stack-based context. For more complex contexts (e.g. asynchronous operat...
How can I negate the return-value of a process?
...t isn't dreadfully hard to write, though - the code below dates back to at least 1991 (though I think I wrote a previous version even longer ago). I don't tend to use this in my scripts, though, because it is not reliably available.
/*
@(#)File: $RCSfile: not.c,v $
@(#)Version: $R...
Shell one liner to prepend to a file
...
This still uses a temp file, but at least it is on one line:
echo "text" | cat - yourfile > /tmp/out && mv /tmp/out yourfile
Credit: BASH: Prepend A Text / Lines To a File
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Making macOS Installer Packages which are Developer ID ready
...n appears to assume that the developer has generated it with --analyze, at least initially.
– bug
Oct 21 '12 at 18:11
1
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How to prove that a problem is NP complete?
...does it have a vertex cover set of size k such that every edge in G has at least one vertex in the cover set?) is in NP:
our input X is some graph G and some number k (this is from the problem definition)
Take our information C to be "any possible subset of vertices in graph G of size k"
Then we ...