大约有 30,000 项符合查询结果（耗时：0.0518秒） [XML]
Unpivot with column name
...le expression can be fully avoided if there are strictly no null values in base table)
select *
from
(
select name, subject,
case subject
when 'Maths' then maths
when 'Science' then science
when 'English' then english
end as Marks
from studentmarks
Cross Join (values('Ma...
What is the maximum length of a valid email address?
...
320
And the segments look like this
{64}@{255}
64 + 1 + 255 = 320
You should also read this if you are validating emails
http://haacked.com/archive/2007/08/21/i-knew-how-to-validate-an-email-address-until-i.aspx
...
How to check whether an object is a date?
...do things */ }
alert( myDate.typof() ); //=> String
[Edit march 2013] based on progressing insight this is a better method:
Object.prototype.is = function() {
var test = arguments.length ? [].slice.call(arguments) : null
,self = this.constructor;
return test ? !!(tes...
How can I run PowerShell with the .NET 4 runtime?
...etframework /v OnlyUseLatestCLR /t REG_DWORD /d 1
reg add hklm\software\wow6432node\microsoft\.netframework /v OnlyUseLatestCLR /t REG_DWORD /d 1
To update just the ISE to use .NET 4.0, you can change the configuration ($psHome\powershell_ise.exe.config) file to have a chunk like this:
<?xml v...
Stack vs heap allocation of structs in Go, and how they relate to garbage collection
...o and I'm experiencing a bit of congitive dissonance between C-style stack-based programming where automatic variables live on the stack and allocated memory lives on the heap and and Python-style stack-based-programming where the only thing that lives on the stack are references/pointers to objects...
Terminal Multiplexer for Microsoft Windows - Installers for GNU Screen or tmux [closed]
... This! Get Msys2 which is a Cygwin fork with support for MinGW-w64 and other windows stuff. I use Zshell with Powerlevel10k and it is fast as can be, very pretty and works just as well with tmux.
– Jose V
Jan 8 at 14:40
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How to track child process using strace?
... for help, clarification, or responding to other answers.Making statements based on opinion; back them up with references or personal experience.To learn more, see our tips on writing great answers.
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How to print the full NumPy array, without truncation?
..., [48, 49, 50, 51], [52, 53, 54, 55], [56, 57, 58, 59], [60, 61,
62, 63], [64, 65, 66, 67], [68, 69, 70, 71], [72, 73, 74, 75], [76, 77, 78, 79], [80, 81,
82, 83], [84, 85, 86, 87], [88, 89, 90, 91], [92, 93, 94, 95], [96, 97, 98, 99]]
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Windows batch files: .bat vs .cmd?
...e: When I mentioned 'NT' I meant basically all Windows versions that we're based on NT (and not 9x). So essentially NT, Win2k, and all versions of Windows for the desktop or server since XP. And the name of the file may give insight into the mindset and coding style of the person who wrote the file...
The forked VM terminated without saying properly goodbye. VM crash or System.exit called
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OpenJDK 64-Bit Server VM warning: ignoring option MaxPermSize=256m; support was removed in 8.0
– Julien
Nov 15 '18 at 9:25
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