大约有 43,000 项符合查询结果（耗时：0.0238秒） [XML]
Storing time-series data, relational or non?
... Form. Very high speed, with just one Index on the PK. For understanding, read this answer from the What is Sixth Normal Form ? heading onwards.
(I have one index only, not three; on the Non-SQLs you may need three indices).
I have the exact same table (without the Id "key", of course). I have ...
Set cURL to use local virtual hosts
... time the question and answer was produced. SO users you can't be bothered reading past the first answer and also evaluate answers based on their timestamps will never get the best help...
– Bruno
Oct 26 '14 at 14:36
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Which HTTP methods match up to which CRUD methods?
...le confused though which methods match up to the classic CRUD methods. GET/Read and DELETE/Delete are obvious enough.
9 Ans...
Use of var keyword in C#
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I still think var can 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>...
Command not found when using sudo
... the command that is used to change the permission settings of a file.
To read the chmod documentation for your local system , run man chmod or info chmod from the command line. Once read and understood you should be able to understand the output of running ...
ls -l foo.sh
... which will list t...
Best introduction to C++ template metaprogramming? [closed]
...f programs at compile-time. A light bulb went off in my head as soon as I read this canonical metaprogramming example:
8 A...
A beginner's guide to SQL database design [closed]
...tware/database-design-tutorial/intro.html
It's pretty concise compared to reading an entire book and it explains the basics of database design (normalization, types of relationships) very well.
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How do I use the conditional operator (? :) in Ruby?
...ast case as said issue does not arise.
You can use the "long-if" form for readability on multiple lines:
question = if question.size > 20 then
question.slice(0, 20) + "..."
else
question
end
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What's the difference between $evalAsync and $timeout in AngularJS?
...distinction between $timeout, $evalAsync, $digest, $apply, I invite you to read my answer on that other question: https://stackoverflow.com/a/23102223/1501926
Also be sure to read the documentation:
The $evalAsync makes no guarantees as to when the expression will be executed, only that:
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How many files can I put in a directory?
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I have had over 8 million files in a single ext3 directory. libc readdir() which is used by find, ls and most of the other methods discussed in this thread to list large directories.
The reason ls and find are slow in this case is that readdir() only reads 32K of directory entries at a t...