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When and why are database joins expensive?
... bulk disk reads which are the most expensive aspect of the exercise by an order of magnitude. Performing a join, by contrast, logically requires retrieval of only the keys. In practice, not even the key values are fetched: the key hash values are used for join comparisons, mitigating the cost of mu...
.c vs .cc vs. .cpp vs .hpp vs .h vs .cxx [duplicate]
... have the necessary cpp wrappers or namespace and then include the .h in order to expose a c library to both c and c++.
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Dynamic LINQ OrderBy on IEnumerable / IQueryable
...Examples for Dynamic LINQ that allows you to use a sql-like string (e.g. OrderBy("Name, Age DESC")) for ordering. Unfortunately, the method included only works on IQueryable<T> . Is there any way to get this functionality on IEnumerable<T> ?
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How do I select text nodes with jQuery?
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I tried this. It prints tag names out of order. Is there a way to print tag names in the order they occur? I asked a separate question here stackoverflow.com/questions/63276378/…
– Amanda
Aug 6 at 4:27
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How do I get the n-th level parent of an element in jQuery?
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Since parents() returns the ancestor elements ordered from the closest to the outer ones, you can chain it into eq():
$('#element').parents().eq(0); // "Father".
$('#element').parents().eq(2); // "Great-grandfather".
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Replacement for “rename” in dplyr
...onious solution but this works and preserves all columns (though not their order). disp does not get duplicated.
– farnsy
Aug 22 '14 at 3:38
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Are list-comprehensions and functional functions faster than “for loops”?
...ension, for example, is indeed faster, it would be a much better option in order to avoid lags (Despite the visual complexity of the code).
Chances are, if code like this isn't already fast enough when written in good non-"optimized" Python, no amount of Python level micro optimization is going to...
Separate REST JSON API server and client? [closed]
...obile app developers who are starting to use parse.com as their backend in order to enable a fast path to #2.
– Rhb123
Jun 8 '12 at 18:12
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Howto: Clean a mysql InnoDB storage engine?
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Highly active question. Earn 10 reputation in order to answer this question. The reputation requirement helps protect this question from spam and non-answer activity.
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How do you get the index of the current iteration of a foreach loop?
...index is beside the point. Additionally, that the linked list does have an order only strengthens Jim's position. All you need to do is number each element in order. Specifically, you can achieve this by incrementing a count while you iterate, or you could generate a list of integers with the same l...