大约有 1,900 项符合查询结果（耗时：0.0170秒） [XML]
Only read selected columns
....g.: fread("data.txt", select = c(1:7), data.table = FALSE)
2) With read.csv.sql from the sqldf-package:
Another alternative is the read.csv.sql function from the sqldf package:
library(sqldf)
dat <- read.csv.sql("data.txt",
sql = "select Year,Jan,Feb,Mar,Apr,May,Jun from ...
How can I interrupt a ServerSocket accept() method?
...red Jun 6 '10 at 10:28
Juha SyrjäläJuha Syrjälä
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云数据及Firebase组件简介 · App Inventor 2 中文网
...签（必须是文本字符串）和一个值（可以是文本、数字、列表或布尔值），并将该值存储在标签下的 Firebase Web 服务中。 要检索存储在标签下的值，请使用 GetValue 块。 GetValue 获取标签并向 Firebase 服务请求存储的值。 所有安装...
使用Activity启动器组件 · App Inventor 2 中文网
...entor 中设置这些。 还有一个 Extras 属性，它采用键和值的列表并指定相应键的属性值。 你必须设置的特定值取决于你要启动的活动。
这里有些例子。
警告：这些示例中的值取决于应用程序用户设备上的 Android 操作系统版本。 ...
How can I perform a culture-sensitive “starts-with” operation from the middle of a string?
...o characters irrespective of casing. For example, under the en-US culture, æ is equal to ae, and ffi is equal to ffi. C-normalization does not handle ligatures at all, since it only allows compatibility mappings (which are typically restricted to combining characters).
– Dougl...
source of historical stock data [closed]
...IS NO LONGER ACCURATE AS THE YAHOO FEED HAS CEASED TO EXIST
Using Yahoo's CSV approach above you can also get historical data!
You can reverse engineer the following example:
http://ichart.finance.yahoo.com/table.csv?s=YHOO&d=0&e=28&f=2010&g=d&a=3&b=12&c=1996&ignore...
How to convert a List into a comma separated string without iterating List explicitly [dupli
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With Java 8:
String csv = String.join(",", ids);
With Java 7-, there is a dirty way (note: it works only if you don't insert strings which contain ", " in your list) - obviously, List#toString will perform a loop to create idList but it does n...
Redirect all output to file [duplicate]
...dited Oct 23 '14 at 9:48
David Pärsson
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answered Jul 13 '11 at 5:16
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How to save MySQL query output to excel or .txt file? [duplicate]
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From Save MySQL query results into a text or CSV file:
MySQL provides an easy mechanism for writing the results of a select
statement into a text file on the server. Using extended options of
the INTO OUTFILE nomenclature, it is possible to create a comma
sepa...
Why both no-cache and no-store should be used in HTTP response?
...he storage of the response in non-volatile media?
– Lèse majesté
Feb 27 '11 at 4:38
4
@Lèsemaj...