大约有 47,000 项符合查询结果(耗时:0.0519秒) [XML]

https://stackoverflow.com/ques... 

Are Stored Procedures more efficient, in general, than inline statements on modern RDBMS's? [duplica

...optimizers have limits and cut-offs for performance reasons). It is not unknown for very complicated SQL to have distinct, measurable (I've seen a complicated query take 10+ seconds just to generate a plan, before we tweaked the DBMS) latencies due to the optimizer trying to figure out the "near bes...
https://stackoverflow.com/ques... 

What is uint_fast32_t and why should it be used instead of the regular int and uint32_t?

... is to work on 32-bit numbers, it's not going to be faster than one cycle. Now, although it is not so on x86/amd64, 32-bit integers may not be even addressable. In such a case working on them requires additional ops to extract the 32-bits from, say, 64-bit aligned units. See also the linked question...
https://stackoverflow.com/ques... 

What's the point of map in Haskell, when there is fmap?

...feel the need for a map function? Couldn't it just be what is currently known as fmap and fmap could be removed from the language? ...
https://stackoverflow.com/ques... 

eval command in Bash and its typical uses

...s put double quotes around variable and command substitutions, unless you know you need to leave them off. Without the double quotes, the shell performs field splitting (i.e. it splits value of the variable or the output from the command into separate words) and then treats each word as a wildcard p...
https://stackoverflow.com/ques... 

How to fix: “UnicodeDecodeError: 'ascii' codec can't decode byte”

...ython 2.x - The Long Version Without seeing the source it's difficult to know the root cause, so I'll have to speak generally. UnicodeDecodeError: 'ascii' codec can't decode byte generally happens when you try to convert a Python 2.x str that contains non-ASCII to a Unicode string without specifyi...
https://stackoverflow.com/ques... 

Group vs role (Any real difference?)

... between group and role? I've been trying to figure this out for some time now and the more information I read, the more I get the sense that this is brought up just to confuse people and there is no real difference. Both can do the other's job. I've always used a group to manage users and their acc...
https://stackoverflow.com/ques... 

Learning assembly [closed]

...other (x86 computers included). But the likelihood that you are using ARM now and dont know enough assembler for it to write startup code or other routines knowing ARM may or may not help what you are trying to do. The second and more important reason for ARM first is because the instruction lengt...
https://stackoverflow.com/ques... 

How do I use $scope.$watch and $scope.$apply in AngularJS?

...e most common scenario and I'm sure you've seen it before, but you didn't know that this has created a watch in the background. Yes, it had! Using AngularJS directives (such as ng-repeat) can also create implicit watches. Ad 2) This is how you create your own watches. $watch service helps you to ru...
https://stackoverflow.com/ques... 

SQL Server CTE and recursion example

...AS MyColName -- Or SELECT MyColName = 1 -- Etc... ) Q 2) now here about CTE and recursion of employee relation the moment i add two manager and add few more employee under second manager then problem start. i want to display first manager detail and in the next rows only those empl...
https://stackoverflow.com/ques... 

How many concurrent requests does a single Flask process receive?

I'm building an app with Flask, but I don't know much about WSGI and it's HTTP base, Werkzeug. When I start serving a Flask application with gunicorn and 4 worker processes, does this mean that I can handle 4 concurrent requests? ...