大约有 43,000 项符合查询结果（耗时：0.0559秒） [XML]
Use cases for NoSQL [closed]
...alytics, Logging and Full Text search. These articles are all well worth a read http://www.mongodb.com/use-cases
There's also a great write-up on which NoSQL database is best suited to which type of project: http://kkovacs.eu/cassandra-vs-mongodb-vs-couchdb-vs-redis
...
What is an index in SQL?
... any index. This is a good start for troubleshooting performance problems. Read more here:
http://dev.mysql.com/doc/refman/5.0/en/explain.html
share
|
improve this answer
|
f...
Convert a matrix to a 1 dimensional array
...
Either read it in with 'scan', or just do as.vector() on the matrix. You might want to transpose the matrix first if you want it by rows or columns.
> m=matrix(1:12,3,4)
> m
[,1] [,2] [,3] [,4]
[1,] 1 4 7 10
...
Cookies vs. sessions
...e of months ago. For the sake of creating a login system for my website, I read about cookies and sessions and their differences (cookies are stored in the user's browser and sessions on the server). At that time, I preferred cookies (and who does not like cookies?!) and just said: "who cares? I don...
How to make a great R reproducible example
...ta)).
Worst case scenario, you can give a text representation that can be read in using the text parameter of read.table :
zz <- "Sepal.Length Sepal.Width Petal.Length Petal.Width Species
1 5.1 3.5 1.4 0.2 setosa
2 4.9 3.0 1.4 ...
Simplest way to serve static data from outside the application server in a Java web application
... configuration example can be found here.
If you want to have control over reading/writing files yourself, then you need to create a Servlet for this which basically just gets an InputStream of the file in flavor of for example FileInputStream and writes it to the OutputStream of the HttpServletResp...
Google Sheets API Setup · App Inventor 2 中文网
...ets Document
3. Record Relevant Information
The Spreadsheet ID
The Sheet Name
The Grid ID
Note: If you are only going to read from the Google Sheets document, and not
edit or write data to the document, you can skip the process o...
How to parse JSON using Node.js? [closed]
...s a global object JSON[docs].
Note - JSON.parse can tie up the current thread because it is a synchronous method. So if you are planning to parse big JSON objects use a streaming json parser.
share
|
...
Is there a good reason to use upper case for SQL keywords? [closed]
...-SQL lowercase with database object names MixedCase.
It is much easier to read, and literals and comments stand out.
share
|
improve this answer
|
follow
|
...
UnicodeEncodeError: 'latin-1' codec can't encode character
...levant part of a linked item is provided in the answer. The link for extra reading is great, but please try to pop in a executive summary in your answer so to speak :)
– Fluffeh
Sep 27 '12 at 9:53
...