大约有 32,293 项符合查询结果（耗时：0.0364秒） [XML]
What is a loop invariant?
...o Algorithm" by CLRS. In chapter 2, the authors mention "loop invariants". What is a loop invariant?
15 Answers
...
What is the purpose of Order By 1 in SQL select statement?
...nd have noticed that there are several views with an order by 1 clause. What does this accomplish?
8 Answers
...
What's the difference between “ ” and “ ”?
Both of them mean space, but is there any difference?
13 Answers
13
...
How can I confirm a database is Oracle & what version it is using SQL?
...on. The user gets to select a datasource they have configured and nominate what type of database it is. I want to confirm that the database type is indeed Oracle, and if possible, what version of Oracle they are running by sending a SQL statement to the datasource.
...
What REST PUT/POST/DELETE calls should return by a convention?
...ppancy, but if you are doing REST over HTTP then RFC7231 describes exactly what behaviour is expected from GET, PUT, POST and DELETE.
Update (Jul 3 '14):
The HTTP spec intentionally does not define what is returned from POST or DELETE. The spec only defines what needs to be defined. The rest is l...
What is the order of precedence for CSS?
...
@jared I swapped the two first points. Is it this what you mean ?
– Lorenz Meyer
Aug 3 '14 at 15:10
...
What are the benefits of functional programming? [closed]
What do you think the benefits of functional programming are? And how do they apply to programmers today?
9 Answers
...
What is a None value?
...
Martijn's answer explains what None is in Python, and correctly states that the book is misleading. Since Python programmers as a rule would never say
Assigning a value of None to a variable is one way to reset it to
its original, empty state.
...
What's the difference between .so, .la and .a library files?
...aries so there is no need to have more than one copy of it in memory). But what is the difference between .a and .la ? Are these all static libraries?
...
What's the difference between an exclusive lock and a shared lock?
...e locks cannot be obtained.
When the students are reading (shared locks) what is on the board:
They all can read what is on it, together => Multiple shared locks can co-exist.
The teacher waits for them to finish reading before she clears the board to write more => If one or more shared lo...