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Select distinct values from a table field

...ant any ordering to be applied to a query, not even the default ordering, call order_by() with no parameters. and distinct() in the note where it discusses issues with using distinct() with ordering. To query your DB, you just have to call: models.Shop.objects.order_by().values('city').distinct(...
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Compile time string hashing

... string length, and the compiler is not clever enough to elide the second call. Check other answers for possible fix for this problem. – CygnusX1 Feb 27 '16 at 16:34 ...
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关于 __VA_ARGS__ 宽字符版本的问题 - C/C++ - 清泛网 - 专注C/C++及内核技术

关于 __VA_ARGS__ 宽字符版本的问题在写一个可变参数的记录日志函数,考虑到宽字符(Unicode版本)时:#define WIDEN2(x) L ## x#define WIDEN(x) WIDEN2(x)#define __...在写一个可变参数的记录日志函数,考虑到宽字符(Unicode版本)时: #defin...
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How to extract the year from a Python datetime object?

...ew times and you'll be prompted with the members of the "now" object: now.__add__ now.__gt__ now.__radd__ now.__sub__ now.fromordinal now.microsecond now.second now.toordinal now.weekday now.__class__ now.__hash__ ...
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Vagrant error : Failed to mount folders in Linux guest

... The plugin vagrant-vbguest solved my problem: $ vagrant plugin install vagrant-vbguest Output: $ vagrant reload ==> default: Attempting graceful shutdown of VM... ... ==> default: Machine booted and ready! GuestAdditions 4.3.12 running --- OK. ==> default: Checking for guest addi...
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Ruby on Rails: Delete multiple hash keys

...re unaware of the Hash#except method ActiveSupport adds to Hash. It would allow your code to be simplified to: redirect_to my_path(params.except(:controller, :action, :other_key)) Also, you wouldn't have to monkey patch, since the Rails team did it for you! ...
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How to Detect if I'm Compiling Code with a particular Visual Studio version?

... _MSC_VER and possibly _MSC_FULL_VER is what you need. You can also examine visualc.hpp in any recent boost install for some usage examples. Some values for the more recent versions of the compiler are: MSVC++ 14.24 _MSC_VER...
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How to validate an Email in PHP?

...hould be replaced by the preg family (PCRE Regex Functions). There are a small amount of differences, reading the Manual should suffice. Update 1: As pointed out by @binaryLV: PHP 5.3.3 and 5.2.14 had a bug related to FILTER_VALIDATE_EMAIL, which resulted in segfault when validating large ...
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How to change the Eclipse default workspace?

... It doesnt allow me to move this folder anywhere outside of my working folder...Is there any workarounds to move this folder into another drive? – Laserson Mar 17 '13 at 14:43 ...
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Code Golf - π day

... Yeah, the ( operator alone allowed to shed 6 strokes! – Dan Andreatta Mar 18 '10 at 10:25 add a comment  |  ...