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How important is the order of columns in indexes?
... 3, the optimizer 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 backtrac...
What does it mean to hydrate an object?
... you probably don't need to deal with hydration explicitly. You would typically use deserialization instead so you can write less code. Some data access APIs don't give you this option, and in those cases you'd also have to explicitly call the hydration step yourself.
For a bit more detail on the c...
express throws error as `body-parser deprecated undefined extended`
In my node app, I am using express. all works fine, But i am getting error in the cmd . I use all are updated modules...
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Case insensitive Query with Spring CrudRepository
...meContainingIgnoreCase(String name);
}
See documentation for a list of all supported keywords inside method names.
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Is there an equivalent to 'continue' in a Parallel.ForEach?
I am porting some code to Parallel.ForEach and got an error with a continue I have in the code. Is there something equivalent I can use in a Parallel.ForEach functionally equivalent to continue in a foreach loop?
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Load “Vanilla” Javascript Libraries into Node.js
... have some functionality I would like to use in a Node.js server. (Specifically I want to use a QuadTree javascript library that I found.) But these libraries are just straightforward .js files and not "Node.js libraries".
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Remove Fragment Page from ViewPager in Android
I'm trying to dynamically add and remove Fragments from a ViewPager, adding works without any problems, but removing doesn't work as expected.
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Convert seconds to HH-MM-SS with JavaScript?
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Granted Moment.js isn't all that big but if all you're doing with it is to convert seconds to hh:mm:ss, it seems like a bit of overkill. Rather use one of the functions suggested in these or other answers.
– Ola Karlsson
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How can I see the specific value of the sql_mode?
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The combination modes are all documented here: dev.mysql.com/doc/refman/5.5/en/server-sql-mode.html. For example, here you can see which 7 modes comprise the ORACLE combination mode: dev.mysql.com/doc/refman/5.5/en/…
– Ike Walk...
C++ performance vs. Java/C#
...p of a virtual machine which abstracts away the native architecture. Logically it would seem impossible for Java or C# to match the speed of C++ because of this intermediate step, however I've been told that the latest compilers ("hot spot") can attain this speed or even exceed it.
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