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When should I use a composite index?
..._C )
will benefit a query that uses those fields for joining, filtering, and sometimes selecting. It will also benefit queries that use left-most subsets of columns in that composite. So the above index will also satisfy queries that need
index( column_A, column_B, column_C )
index( column_A, col...
Correct format specifier for double in printf
...e before printf receives it1. "%lf" is also acceptable under the current standard -- the l is specified as having no effect if followed by the f conversion specifier (among others).
Note that this is one place that printf format strings differ substantially from scanf (and fscanf, etc.) format stri...
Are memory leaks ever ok? [closed]
...ever OK to do this?" but rather "Is there ever a good reason to do this?" And "hunting down that memory leak is a pain" isn't a good reason.
I like to keep things simple. And the simple rule is that my program should have no memory leaks.
That makes my life simple, too. If I detect a memory lea...
Do you put unit tests in same project or another project?
...s. Having an extra project (or 10) isn't a con.
Edit: More Info On Build and Shipping
I would further recommend that any automated build process place production and unit tests into different locations. Ideally, the unit test build process only runs if the production code builds, and copies the ...
Differences between git remote update and fetch?
...etch Documentation/RelNotes/* | less
Then I did a less search for --all, and this is what I found under the release notes for Git version 1.6.6:
git fetch learned --all and --multiple options, to run fetch from many repositories, and --prune option to remove remote tracking branches that went ...
“Least Astonishment” and the Mutable Default Argument
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Actually, this is not a design flaw, and it is not because of internals, or performance.
It comes simply from the fact that functions in Python are first-class objects, and not only a piece of code.
As soon as you get to think into this way, then it completely ...
Why should I capitalize my SQL keywords? [duplicate]
... latter is more readable. You can easily separate the keywords from table and column names, etc.
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REST API - why use PUT DELETE POST GET?
So, I was looking through some articles on creating REST API's.
And some of them suggest using all types of HTTP requests: like PUT DELETE POST GET .
We would create for example index.php and write API this way:
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How to use Servlets and Ajax?
I'm very new to web apps and Servlets and I have the following question:
7 Answers
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What's the difference between git clone --mirror and git clone --bare
...es of the target, it maps all refs (including remote branches, notes etc.) and sets up a refspec configuration such that all these refs are overwritten by a git remote update in the target repository.
My original answer also noted the differences between a bare clone and a normal (non-bare) clone ...