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Foreign Key to non-primary key
...a UNIQUE constraint in another table.
So in your case if you make AnotherID unique, it will be allowed. If you can't apply a unique constraint you're out of luck, but this really does make sense if you think about it.
Although, as has been mentioned, if you have a perfectly good primary key as a ...
Case insensitive regex in JavaScript
..., world!';
return foo.toLowerCase() === isFoo.toLowerCase();
I would also call this easier to read and grok the author's intent!
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Multiple aggregations of the same column using pandas GroupBy.agg()
...g functions f1, f2 to the same column df["returns"] , without having to call agg() multiple times?
3 Answers
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How to change href of tag on button click through javascript
... f1();">jhhghj</a>
....or, the unobtrusive way:
<a href="#" id="abc">jhg</a>
<a href="#" id="myLink">jhhghj</a>
<script type="text/javascript">
document.getElementById("myLink").onclick = function() {
document.getElementById("abc").href="xyz.php";
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Why there can be only one TIMESTAMP column with CURRENT_TIMESTAMP in DEFAULT clause?
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We can give a default value for the timestamp to avoid this problem.
This post gives a detailed workaround:
http://gusiev.com/2009/04/update-and-create-timestamps-with-mysql/
create table test_table(
id integer not null auto_increment primary key,
stamp_created timestamp ...
File extension for PowerShell 3
...Photoshop. Other sources say that versioning had been indeed the reason to call it ps1, but they dropped this idea when introducing PS 2 (official source).
– ComFreek
Sep 8 '14 at 18:52
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What is choice_set in this Django app tutorial?
...Django's ORM follows the relationship backwards from Question too, automatically generating a field on each instance called foo_set where Foo is the model with a ForeignKey field to that model.
choice_set is a RelatedManager which can create querysets of Choice objects which relate to the Question ...
What's a 3D doing in this HTML?
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It's an email encoding system called "quoted-printable", which allows non-ASCII characters to be represented as ASCII for email transportation.
In quoted-printable, any non-standard email octets are represented as an = sign followed by two hex digits rep...
Checkbox for nullable boolean
...ticking
@model bool?
@Html.CheckBox("", Model.GetValueOrDefault())
inside.
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实现一个简单的服务端推方案 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...便主动通知Nginx，并把相应的标识（比如一个自增的整数ID）保存在Nginx共享内存中，接下来，Nginx不会再去轮询数据库，而是改为轮询本地的共享内存，通过比对标识来判断是否有新消息，如果有便给客户端发出响应。
注：服...