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In SQL, how can you “group by” in ranges?
... 9 then ' 0- 9'
when score between 10 and 19 then '10-19'
else '20-99' end as range
from scores) t
group by t.range
or
select t.range as [score range], count(*) as [number of occurrences]
from (
select user_id,
case when score >= 0 and score< 10 then '0-9'
wh...
What would be C++ limitations compared C language? [closed]
...n a project I'm working on, this is what happens if you just swap gcc std=c99 for g++:
sandiego:$ g++ -g -O1 -pedantic -mfpmath=sse -DUSE_SSE2 -DUSE_XMM3 -I src/core -L /usr/lib -DARCH=elf64 -D_BSD_SOURCE -DPOSIX -D_ISOC99_SOURCE -D_POSIX_C_SOURCE=200112L -Wall -Wextra -Wwrite-strings -Wredundant...
What does the restrict keyword mean in C++?
...commends it's usage when available:
restrict keyword
! New to 1999 ANSI/ISO C standard
! Not in C++ standard yet, but supported by many C++ compilers
! A hint only, so may do nothing and still be conforming
A restrict-qualified pointer (or reference)...
! ...
Converting a string to int in Groovy
...e toInteger() method to convert a String to an Integer, e.g.
int value = "99".toInteger()
An alternative, which avoids using a deprecated method (see below) is
int value = "66" as Integer
If you need to check whether the String can be converted before performing the conversion, use
String nu...
What happens if I define a 0-size array in C/C++?
...
An array cannot have zero size.
ISO 9899:2011 6.7.6.2:
If the expression is a constant expression, it shall have a value greater than zero.
The above text is true both for a plain array (paragraph 1). For a VLA (variable length array), the behavior is undef...
Why #define TRUE (1==1) in a C boolean macro instead of simply as 1?
...work nicely in the C++. foo(TRUE) will want the int overload.
Of course, C99 introduced bool, true, and false and these can be used in header files that work with C99 and with C.
However:
this practice of defining TRUE and FALSE as (0==0) and (1==0) predates C99.
there are still good reasons to ...
App Inventor 2 文本输入框怎么设置输入数子上下限！ - App应用开发 - 清...
...入框怎么设置输入数字上下限！例如设置下限为0.1 上限99 如果下限输入小于0自动改为0.1,输入大于99自动改为99, 在下限0.1 与上限99 之间能任意输入,怎么做?目前只能点计算按钮，事件中加判断，不合适提醒并改成边界值。下个 ...
Assign a variable inside a Block to a variable outside a Block
...
Luke
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answered Jan 10 '14 at 7:15
Umesh SawantUmesh Sawa...
In Objective-C why should I check if self = [super init] is not nil?
... that if (self != nil) check is there, for proper operation of your class, 99.99% of the time you actually do need self to be non-nil.
Now, suppose, for whatever reason, [super init] did return nil, basically your check against nil is basically passing the buck up to the caller of your class, where...
64-bit version of Boost for 64-bit windows
...
I've got the built binaries on my site:
http://boost.teeks99.com
Edit 2013-05-13: My builds are now available (starting from 1.53) directly from the sourceforge page.
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