大约有 8,000 项符合查询结果（耗时：0.0206秒） [XML]
What's faster, SELECT DISTINCT or GROUP BY in MySQL?
...y i) a;
count
10001
(1 row)
Time: 594,481 ms
http://www.pgsql.cz/index.php/PostgreSQL_SQL_Tricks_I
so be careful ... :)
share
|
improve this answer
|
follow
...
How can two strings be concatenated?
...
or if you often want to join strings from a vector (like implode() from PHP):
implode <- function(..., sep='') {
paste(..., collapse=sep)
}
Allows you do do this:
p('a', 'b', 'c')
#[1] "abc"
vec <- c('a', 'b', 'c')
implode(vec)
#[1] "abc"
implode(vec, sep=', ')
#[1] "a, b, c"
Als...
How to parse JSON in Python?
... you are getting a json from a url like this:
j = urllib2.urlopen('http://site.com/data.json')
you will need to use json.load, not json.loads:
j_obj = json.load(j)
(it is easy to forget: the 's' is for 'string')
share
...
Android: show soft keyboard automatically when focus is on an EditText
...ode line you have mentioned. :) Once again thanks.
– PHP Avenger
Nov 16 '13 at 21:42
I get a 'cannot resolve getWindow...
How to use the PI constant in C++
...rd library which is magnitudes bigger than C++' (e.g. Python, Haskell, C#, PHP, Delphi, Erlang, Java, ......). From personal experience, that elitist not gonna use libs-opinion is a pest and probably the number one reason for bad software written in C++.
– Sebastian Mach
...
TaifunPlayer 扩展（Audio Player）：音频播放器扩展，支持流媒体播放控制 ...
...，原作者为 Taifun。
原始链接：https://puravidaapps.com/player.php
文档翻译和整理：AI2中文网
您的改进建议 联系方式： 不需要回复的可留空~ 意见反馈（300字以内）： 给个鼓励...
How to hide Bootstrap modal with javascript?
I've read the posts here, the Bootstrap site, and Googled like mad - but can't find what I'm sure is an easy answer...
24 A...
Have bash script answer interactive prompts [duplicate]
...hema exporter so my file looked like this.
-- This is an example only --
php vendor/bin/mysql-workbench-schema-export mysqlworkbenchfile.mwb ./doctrine << EOF
`#Export to Doctrine Annotation Format` 1
`#Would you like to change the setup configuration befo...
Create table with jQuery - append
... version to display a dynamic table in App Inventor puravidaapps.com/table.php
– Taifun
Aug 15 '12 at 18:56
2
...
Android 1.6: “android.view.WindowManager$BadTokenException: Unable to add window — token null is not
...
Ditto on the getApplicationContext thing.
The documents on the android site says to use it, but it doesn't work...grrrrr :-P
Just do:
dialog = new Dialog(this);
"this" is usually your Activity from which you start the dialog.
...