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Is there any difference between GROUP BY and DISTINCT

... MusiGenesis' response is functionally the correct one with regard to your question as stated; the SQL Server is smart enough to realize that if you are using "Group By" and not using any aggregate functions, then what you actually mean is "Distinct" - and th...
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Discuz菜单栏下面广告怎么弄? - 更多技术 - 清泛网 - 专注C/C++及内核技术

...href="http://www.discuz.net/thread-1630664-1-1.html" target="_blank">常见问题</a> — <a href="http://www.discuz.net/forum-213-1.html" target="_blank">版块讨论</a></em> </p> <p class="z dzfbl" style="text-indent:15px;background:none"> <em><a href="http://www.comsenz.com/purchase" ...
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win10启动过程中黑屏时间长的解决办法 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...屏时间长的解决办法关闭显卡的ULPS功能可完全解决这个问题。1.下载该文件:ulps_enable_disable.zip2.双击 Disable ULPS.reg。(Disable关闭,Enable是开启...关闭显卡的ULPS功能可完全解决这个问题。 1.下载该文件:ulps_enable_disable.zip 2.双击...
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程序员羊皮卷下载版.pdf - 文档下载 - 清泛网 - 专注C/C++及内核技术

...救世主 20 第2 章 四招找到好工作 20 求职中的心理健康问题 20 大专生求职受歧视 21 这世界并不亏欠我们什么 23 求职中的正确态度 24 面试前充分准备 24 专注于真正的机会 25 五个步骤查实公司信息 26 筛选重点应聘目标 27 ...
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Are Java static calls more or less expensive than non-static calls?

...e any difference. Hotspot may choose to optimize in ways that make static calls faster for one method, non-static calls faster for another. Third: much of the mythos surrounding static versus non-static are based either on very old JVMs (which did not do anywhere near the optimization that Hotspot ...
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C# 能否获取一个对象所占内存的大小? - 更多技术 - 清泛网 - 专注C/C++及内核技术

...所占内存的大小?今日,在项目重构的时候忽然想到一个问题,一个类哪些成员的增加,会影响一个类所占内存的大小?C#有没有办法知道一个对象占多少内存呢? ...今日,在项目重构的时候忽然想到一个问题,一个类哪些成员...
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How do I use IValidatableObject?

... Prop1 = 1, Prop2 = 2 }; bool validateAllProperties = false; var results = new List&lt;ValidationResult&gt;(); bool isValid = Validator.TryValidateObject( toValidate, new ValidationContext(toValidate, null, null), ...
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How to fix “ImportError: No module named …” error in Python?

... Thanks for saving me sometime. – cpu_meltdown Mar 31 '17 at 13:24 add a comment  |  ...
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filename and line number of python script

...ethod have any performance impact (like minor increase in run time or more CPU needed ) ? – gsinha Dec 14 '14 at 5:41 8 ...
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UCenter实现各系统通信的原理 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...体使用方法,你可以思考一下(本文后面也有介绍),有问题可以在此文结尾发表评论与我讨论。 运行后,查看源代码即可看到javascript; 这里要注意了:这些javascript的通知中是不包含用户登录的应用的。也就是说只"通知"用户...