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Make the current commit the only (initial) commit in a Git repository?
...lso removes the configuration of the repository.
Note: This does NOT work if the repository has submodules! If you are using submodules, you should use e.g. interactive rebase
Step 1: remove all history (Make sure you have backup, this cannot be reverted)
cat .git/config # note <github-uri>...
How to UPSERT (MERGE, INSERT … ON DUPLICATE UPDATE) in PostgreSQL?
...ou're on 9.5 and don't need to be backward-compatible you can stop reading now.
9.4 and older:
PostgreSQL doesn't have any built-in UPSERT (or MERGE) facility, and doing it efficiently in the face of concurrent use is very difficult.
This article discusses the problem in useful detail.
In general y...
data.table vs dplyr: can one do something well the other can't or does poorly?
...ters. As Grace Hopper would say, Mind your nanoseconds!
3. Syntax
Let's now look at syntax. Hadley commented here:
Data tables are extremely fast but I think their concision makes it harder to learn and code that uses it is harder to read after you have written it ...
I find this remark poi...
'UserControl' constructor with parameters in C#
...me crazy, but I'm the type of guy that likes constructors with parameters (if needed), as opposed to a constructor with no parameters followed by setting properties. My thought process: if the properties are required to actually construct the object, they should go in the constructor. I get two adva...
Eclipse: have the same file open in two editors?
...
This seems to now be in the File-> New View Into File which opens the tab with focus into a new tab in the same group where you can then drag it to another group if you wish.
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Different bash prompt for different vi editing mode?
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Just adding on from eMPee584 - if you are running bash 4.3 or higher, add the following to your ~/.inputrc file set show-mode-in-prompt This adds a + to the very left of your prompt if you are in edit mode, and a : if you are in command mode.
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c++ Timer使用总结 - C/C++ - 清泛网 - 专注C/C++及内核技术
...age(&msg,NULL,NULL,NULL)) && (itemp!=0) && (-1 != itemp) )
{
if (msg.message == WM_TIMER)
{
std::cout << "i got the message " << std::endl;
TranslateMessage(&msg);
DispatchMessage(&msg);
}
}
}
多线程使用Timer：
#include <stdafx.h>
#inc...
Cron job every three days
...
Run it every three days...
0 0 */3 * *
How about that?
If you want it to run on specific days of the month, like the 1st, 4th, 7th, etc... then you can just have a conditional in your script that checks for the current day of the month.
if (((date('j') - 1) % 3))
exit();
or...
CSS technique for a horizontal line with words in the middle
... my favourite solution. It works on OSX too and some of the others dont. If you use this solution remember to set the background of the span to the same color as the background of your page, it will be especially obvious what i mean if your background isn't white. ;)
– DrLaze...
Clojure: reduce vs. apply
I understand the conceptual difference between reduce and apply :
9 Answers
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