大约有 14,000 项符合查询结果（耗时：0.0307秒） [XML]
IN vs OR in the SQL WHERE Clause
...
I assume you want to know the performance difference between the following:
WHERE foo IN ('a', 'b', 'c')
WHERE foo = 'a' OR foo = 'b' OR foo = 'c'
According to the manual for MySQL if the values are constant IN sorts the list and then uses a binary search. I would imagine that OR evaluates t...
Is there a way to get rid of accents and convert a whole string to regular letters?
...ut if you need to do this with a lot of text, pre-compiling the regex is a win.
– David Conrad
Mar 3 '13 at 21:49
3
...
Why do you not use C for your web apps?
...grams. That means you pay more.
Also, C doesn't have the benefit of drawing from an enormous single standard library of functionality as .NET (and the other major web-centric platforms) has. So you may have to either buy components, or perform interop, or roll your own functionality which comes...
HTML5shiv vs Dean Edwards IE7-js vs Modernizr - which to choose?
...ard that jQuery won but for now there's no telling which one of these will win this particular fight. I don't think I could recommend dean edwards ie7-js as it mostly deals with just getting IE7 to act like other more intelligent and likable browsers as opposed to leveraging the whole HTML5 thing as...
How can I obtain the element-wise logical NOT of a pandas Series?
...
it may not be correct on a different platform. Win 7, python 3.6.3 numpy 1.13.3, pandas 0.20.3, (-s) will be the fastest, (~s) is the second, and np.invert(s) is the slowest one
– gaozhidf
Apr 8 '18 at 1:25
...
PDO MySQL: Use PDO::ATTR_EMULATE_PREPARES or not?
...h they are cached. In my experience the query cache isn't often a very big win anyway. Queries and schemas need special construction to make maximum use of the cache. Often application-level caching ends up being necessary anyway in the long run.
Native prepares doesn't make any difference for secur...
Is the creation of Java class files deterministic?
...s not the same, because you have different binaries on each platform (e.g. Win7, Linux, Solaris, Mac). For a vendor, it does not make sense to have different implementations, but any platform specific issue can influence the result (e.g. flie ordering in a directory (think on your lib directory), en...
What is the reason for performing a double fork when creating a daemon?
I'm trying to create a daemon in python. I've found the following question , which has some good resources in it which I am currently following, but I'm curious as to why a double fork is necessary. I've scratched around google and found plenty of resources declaring that one is necessary, but not ...
What is the fastest substring search algorithm?
..., the better with longer inputs. With very short needles, brute force may win.
Edit:
A different algorithm might be best for finding base pairs, english phrases, or single words. If there were one best algorithm for all inputs, it would have been publicized.
Think about the following little tab...
How to exclude certain directories/files from git grep search
...s there a solution to this (w/o having to emply sed myself) ? [git bash on win7]
– elonderin
Sep 26 '17 at 17:15
...