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Foreign Key to non-primary key
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If you really want to create a foreign key to a non-primary key, it MUST be a column that has a unique constraint on it.
From Books Online:
A FOREIGN KEY constraint does not have to be linked only to a PRIMARY
KEY constraint in...
Where do you store your salt strings?
...ght about a salt per user I was thinking that a single salt would work for all users. What about a salt that is stored as an XML file that is loaded by the App Server? or maybe somehow hardcoded into a servlet?
– jigzat
Jul 25 '12 at 2:58
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Can an angular directive pass arguments to functions in expressions specified in the directive's att
...d this technique from an excellent article by Dan Wahlin at http://weblogs.asp.net/dwahlin/creating-custom-angularjs-directives-part-3-isolate-scope-and-function-parameters
I added the unwrapping step to make calling the function more natural and to solve for the nesting issue which I had encounter...
Why does base64 encoding require padding if the input length is not divisible by 3?
... the protocol used padding, there would be no need to transmit a length at all. The data could be encoded as it came in from the camera, each chunk terminated with padding, and the receiver would be able to decode the stream correctly.
Obviously that's a very contrived example, but perhaps it illus...
App Inventor 2 扩展 · App Inventor 2 中文网
...its blocks from the project and you will not see it in Extensions palette panel anymore.
Figure 5: Click the X to delete an imported extension.
2.5 Sharing projects that use extension components
You export and import projects that use extension components just like other App Inventor projects, ...
LR性能测试结果样例分析 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...器错误：URL 授权域无法找到。
500 100 内部服务器错误：ASP 错误。
501 标题值指定的配置没有执行。
502 Web 服务器作为网关或代理服务器时收到无效的响应。
并发数分析
“Running Vusers（运行的并发数）”显示了在...
How to choose an AES encryption mode (CBC ECB CTR OCB CFB)?
...not decryption, which can save code space.
CTR is used if you want good parallelization (ie. speed), instead of CBC/OFB/CFB.
XTS mode is the most common if you are encoding a random accessible data (like a hard disk or RAM).
OCB is by far the best mode, as it allows encryption and authentication in ...
Can someone explain __all__ in Python?
I have been using Python more and more, and I keep seeing the variable __all__ set in different __init__.py files. Can someone explain what this does?
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How to find all the subclasses of a class given its name?
I need a working approach of getting all classes that are inherited from a base class in Python.
10 Answers
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Difference between left join and right join in SQL Server [duplicate]
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@SilapAliyev That's actually a very good question. Can anyone answer? :D
– Ian Chu Te
Jan 8 '16 at 2:46
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