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Use of var keyword in C#
... make code more readable in some cases. If I have a Customer class with an Orders property, and I want to assign that to a variable, I will just do this:
var orders = cust.Orders;
I don't care if Customer.Orders is IEnumerable<Order>, ObservableCollection<Order> or BindingList<Orde...
When and why are database joins expensive?
... bulk disk reads which are the most expensive aspect of the exercise by an order of magnitude. Performing a join, by contrast, logically requires retrieval of only the keys. In practice, not even the key values are fetched: the key hash values are used for join comparisons, mitigating the cost of mu...
Where does 'Hello world' come from?
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CMake使用教程 - C/C++ - 清泛网 - 专注C/C++及内核技术
...过make命令构建项目生成目标文件，还支持安装（make install）、测试安装的程序是否能正确执行（make test，或者ctest）、生成当前平台的安装包（make package）、生成源码包（make package_source）、产生Dashboard显示数据并上传等高级功...
How do I handle too long index names in a Ruby on Rails ActiveRecord migration?
...index becomes idx
Singular table name
No joining words
No _id
Alphabetical order
Which usually does the job.
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Properties order in Margin
...lly you can specify a single size:
Margin="1"
used for all sides
The order is the same as in WinForms.
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oracle group 取每组第一条 - 数据库(内核) - 清泛网 - 专注C/C++及内核技术
...CT * FROM(
SELECT z.type , z.code ,ROW_NUMBER()
OVER(PARTITION BY z.type ORDER BY z.code) AS code_id
FROM group_info z
)
WHERE code_id =1;
这里涉及到的over()是oracle的分析函数。
参考sql reference文档：
Analytic functions compute an aggregate value based on a group of ...
How to Get the Title of a HTML Page Displayed in UIWebView?
...h is ) because the location is by the first character of the string.
So in order to offset that, we just added the length of the string
Now keep in mind this code is not tested.. if there are any problems it might be a spelling error, or that I didn't/did add a pointer when i wasn't supposed to.
I...
enum.values() - is an order of returned enums deterministic
...e:
@return an array containing the constants of this enum type, in the order they're declared [Source]
So, yes, they will be returned in declaration order. It's worth noting that the order might change over time if someone changes the class so be very careful about how you use this.
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What is the difference between an ORM and an ODM?
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mongoose, mongoid are all ODM's. I guess for a noSQL we can only have ODMs.
– Luna Lovegood
Nov 14 '18 at 4:04
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