大约有 30,000 项符合查询结果（耗时：0.0288秒） [XML]
Is there a REAL performance difference between INT and VARCHAR primary keys?
...ary key, then do it.
Don't use either strategy for all tables in your database. It's likely that in some cases, a natural key is better, but in other cases a surrogate key is better.
Other folks make a good point that it's rare in practice for a natural key to never change or have duplicates, s...
How to set Java environment path in Ubuntu
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Already solved here stackoverflow.com/questions/24641536/…
– user1420482
Apr 16 '18 at 2:02
1
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Indent starting from the second line of a paragraph with CSS
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@Reuben Based on your comment which has now been deleted, I assume you did in face mean FROM the second line - and for the sake of future visitors, perhaps this fiddle is better, where the syntax is P not div or span. jsfiddle.net/gg...
Intro to GPU programming [closed]
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Take a look at the ATI Stream Computing SDK. It is based on BrookGPU developed at Stanford.
In the future all GPU work will be standardized using OpenCL. It's an Apple-sponsored initiative that will be graphics card vendor neutral.
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Convert blob to base64
This is a snippet for the code that I want to do Blob to Base64 string:
9 Answers
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How to install therubyracer gem on 10.10 Yosemite?
...ll
bundle exec rake clean build binary
gem install pkg/libv8-3.16.14.3-x86_64-darwin-12.gem #note that libv8 version may change, so tab through files in pkg/, also remember to use the one with version specified
then just bundle your project gems
this is the only way it worked for me on 10.10 (rub...
Linux环境离线安装docker&docker-compose - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...客
可以选择对应平台的版本进行下载，此文档以x86_64平台的v26.1.4版本为准，获取版本离线包如下所示：
百度网盘获取docker、docker-compose版本详细信息如下所示：
2、安装docker
# 将下载后的docker安装包传至需要...
How to enable C++11/C++0x support in Eclipse CDT?
...ypes are recognised, but I can't get rid of editor syntax errors for range based for loops and rvalue references &&.
– juanchopanza
May 3 '12 at 13:09
7
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How do I make an HTML text box show a hint when empty?
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In the absence of any styles, in Chrome this looks like:
You can try demos out here and in HTML5 Placeholder Styling with CSS.
Be sure to check the browser compatibility of this feature. Support in Firefox was added in 3.7. Chrome is fine. Internet Explorer only added support in 10. If you t...
Update multiple rows in same query using PostgreSQL
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Based on the solution of @Roman, you can set multiple values:
update users as u set -- postgres FTW
email = u2.email,
first_name = u2.first_name,
last_name = u2.last_name
from (values
(1, 'hollis@weimann.biz', 'Holli...