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How important is the order of columns in indexes?
... wouldn't even use the index, because it's not helpful at all in narrowing down the result sets. Anytime you're in a query, narrowing down the number of results to deal with before the next step means better performance.
Since the index is also stored this way, there's no backtracking across the i...
Python try-else
...want to catch exceptions it raises, but there's something else you want to do if the first operation succeeds, and you don't want to catch an IOError from that operation, you might write something like this:
try:
operation_that_can_throw_ioerror()
except IOError:
handle_the_exception_someho...
How to sort an array by a date property
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Do not recommend creating new Date objects inside the sort method. Have hit production performance issues specifically for that reason. Do not allocate memory (and GC) inside a sort method.
– MikeMurko
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Why is try {…} finally {…} good; try {…} catch{} bad?
...at it is bad form to use catch with no arguments, especially if that catch doesn't do anything:
20 Answers
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what is “strict mode” and how is it used?
...strict mode" . I read it over and I'm having trouble understanding what it does. Can someone briefly explain (in general) what its purpose is and how it is useful?
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How to properly match varargs in Mockito
...it compatible with any var arg types (e.g. String ..., Integer ..., etc.), do an explicit casting. For example, if you have doSomething(Integer number, String ... args) you can do the mock/stub code with something like when(mock).doSomething(eq(1), (String) anyVarargs()). That should take care of th...
Notepad++ show open files on the left
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Settings > Preferences > tab General > Document List Panel > check Show
Credit to anonymous coward
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Find all storage devices attached to a Linux machine [closed]
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There's kind of a limit on what you can do from a shell. Most of the other suggestions that are higher rated either don't work from a shell, won't work unless dbus is running, or will list devices that aren't actually present/configured. This is just faster than c...
How exactly does CMake work?
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The secret is that you don't have to understand what the generated files do.
CMake introduces a lot of complexity into the build system, most of which only pays off if you use it for building complex software projects.
The good news is that CMake...
How to convert a data frame column to numeric type?
How do you convert a data frame column to a numeric type?
18 Answers
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