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In SQL, what's the difference between count(column) and count(*)?
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Just curious: if you have a row with all NULLs, would count(*) still count it, or is just count(column) for all columns?
– Joel Coehoorn
Sep 12 '08 at 15:29
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Is there a documented way to set the iPhone orientation?
I have an app where I would like to support device rotation in certain views but other don't particularly make sense in Landscape mode, so as I swapping the views out I would like to force the rotation to be set to portrait.
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Attach to a processes output for viewing
...l application. Screen sessions can be attached and detached, but are nominally meant only to be used by the same user, so if you want to share them between users, it's a big pain in the ass.
share
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Difference between File.separator and slash in paths
...ies for dealing with files, you can safely use / (slash, not backslash) on all platforms. The library code handles translating things into platform-specific paths internally.
You might want to use File.separator in UI, however, because it's best to show people what will make sense in their OS, rath...
Difference between natural join and inner join
...aspect of a natural join. The things you need to know are (A) it automatically joins on fields of the same name and (B) it will f*** up your s*** when you least expect it. In my world, using a natural join is grounds for dismissal.
– user565869
Jan 6 '14 at 1...
Elegant solution to duplicate, const and non-const, getters? [duplicate]
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I recall from one of the Effective C++ books that the way to do it is to implement the non-const version by casting away the const from the other function.
It's not particularly pretty, but it is safe. Since the member function c...
Git authentication fails after enabling 2FA
...PlaintextPassword@example.com.
Storing password(s) in plaintext would normally be considered as a security risk. But in this 2FA case, the credential is NOT your real password, it is a randomly generated string. So it is as secure as using a ssh private key a passphrase-less ssh private key. CAVEAT...
乘着App的创业浪潮 行业短信也迎来了新生和爆发 - 资讯 - 清泛网 - 专注C/C...
...的公司负责人告诉笔者，他们则是利用技术手段，通过对cmpp，smgp，cmgp接口的封装技术，让短信走单发接口，可以保证短信在任意时刻5秒内收到。为此，大半年的时间里，该团队都保持着6*18小时的工作常态，进行技术攻关，很...
ZMQ: 基本原理 - 开源 & Github - 清泛网移动版 - 专注C/C++及内核技术
ZMQ: 基本原理0MQ-The-Theoretical-Foundation介绍与其他的基于常规理论基础的（集中）通信系统不同，几乎没有分布式通信系统的什么资料，ØMQ(ZeroMQ)是感兴趣的读者少数能请举出...
介绍
与其他的基于常规理论基础的...
How to insert a row in an HTML table body in JavaScript
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