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How to use GROUP_CONCAT in a CONCAT in MySQL
... AS NAME
FROM test
GROUP BY ID, NAME
) AS A
GROUP BY ID;
SQL Fiddle: http://sqlfiddle.com/#!2/b5abe/9/0
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MySQL - length() vs char_length()
...eUploader: {
brandingHtml: "Powered by \u003ca href=\"https://imgur.com/\"\u003e\u003csvg class=\"svg-icon\" width=\"50\" height=\"18\" viewBox=\"0 0 50 18\" fill=\"none\" xmlns=\"http://www.w3.org/2000/svg\"\u003e\u003cpath d=\"M46.1709 9.17788C46.1709 8.26454 46.2665 7.94324 4...
How does collections.defaultdict work?
...
There is a great explanation of defaultdicts here: http://ludovf.net/blog/python-collections-defaultdict/
Basically, the parameters int and list are functions that you pass. Remember that Python accepts function names as arguments. int returns 0 by default and list returns a...
Should IBOutlets be strong or weak under ARC?
...rong should be the default and that the developer docs are being updated.
https://twitter.com/_danielhall/status/620716996326350848
https://twitter.com/_danielhall/status/620717252216623104
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Get fully qualified class name of an object in Python
...
larsks: yes it is, stackoverflow.com/questions/5271112/…
– Yaroslav Bulatov
Apr 4 '15 at 21:17
1
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How to get the IP address of the docker host from inside a docker container
...meta-data for the host is still available from inside the container.
curl http://169.254.169.254/latest/meta-data/local-ipv4
For example:
$ docker run alpine /bin/sh -c "apk update ; apk add curl ; curl -s http://169.254.169.254/latest/meta-data/local-ipv4 ; echo"
fetch http://dl-cdn.alpinelinux...
Get current URL path in PHP [duplicate]
...
<?php
function current_url()
{
$url = "http://" . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'];
$validURL = str_replace("&", "&amp", $url);
return $validURL;
}
//echo "page URL is : ".current_url();
$offer_url = current_url();
?>
<?ph...
[精华] VC中BSTR、Char和CString类型的转换 - C/C++ - 清泛网 - 专注C/C++及内核技术
...ar*
方法一，使用ConvertBSTRToString。例如：
#include #pragma comment(lib, "comsupp.lib")
int _tmain(int argc, _TCHAR* argv[])
{
BSTR bstrText = ::SysAllocString(L"Test");
char* lpszText2 = _com_util::ConvertBSTRToString(bstrText);
SysFreeString(bstrText); // 用完释...
How to clear Facebook Sharer cache?
...
I found a solution to my problem. You could go to this site:
https://developers.facebook.com/tools/debug
...then put in the URL of the page you want to share, and click "debug". It will automatically extract all the info on your meta tags and also clear the cache.
...
How to URL encode a string in Ruby
... They deprecated that method, use * CGI.escape * instead. -> http://www.ruby-forum.com/topic/207489#903709. You should also be able to use URI.www_form_encode * URI.www_form_encode_component *, but I have never used those
– J-Rou
Jul 6 '12 at 14:...