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Why is LINQ JOIN so much faster than linking with WHERE?
... This means the Where condition is evaluated for each combination of rows (n1 * n2 * n3 * n4)
The Join operator takes the rows from the first tables, then takes only the rows with a matching key from the second table, then only the rows with a matching key from the third table, and so on. This is mu...
Git log to get commits only for a specific branch
...a master branch
Do a few commits
You created a branch named b2
Do git log -n1; the commit Id is the merge base between b2 and master
Do a few commits in b2
git log will show your log history of b2 and master
Use commit range, if you aren't familiar with the concept, I invite you to google it or stac...
How to open, read, and write from serial port in C?
...
}
set_interface_attribs (fd, B115200, 0); // set speed to 115,200 bps, 8n1 (no parity)
set_blocking (fd, 0); // set no blocking
write (fd, "hello!\n", 7); // send 7 character greeting
usleep ((7 + 25) * 100); // sleep enough to transmit the 7 plus
...
Calling a class function inside of __init__
...the MyClass object. Where would self be necessary?
– n1k31t4
Jul 1 '18 at 13:25
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Can “git pull --all” update all my local branches?
... then
REMOTES=$(git remote);
fi
REMOTES=$(echo "$REMOTES" | xargs -n1 echo)
CLB=$(git rev-parse --abbrev-ref HEAD);
echo "$REMOTES" | while read REMOTE; do
git remote update $REMOTE
git remote show $REMOTE -n \
| awk '/merges with remote/{print $5" "$1}' \
| while read RB...
Is there a way to cause git-reflog to show a date alongside each entry?
...to)%h %<|(20)%gd %C(blue)%ci%C(reset) %gs (%s)'
– n1k31t4
Oct 9 '19 at 8:50
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Why is using 'eval' a bad practice?
...a program calc, and to add numbers it executes print(eval("{} + {}".format(n1, n2))) and exits. Now you distribute this program with some OS. Then someone makes a bash script that takes some numbers from a stock site and adds them using calc. boom?
– L̲̳o̲̳̳n̲̳̳g̲̳̳p...
婚庆O2O：领跑的企业也就只走到B轮 - 资讯 - 清泛网 - 专注C/C++及内核技术
...什么毛病吧？我给你介绍个对象吧！啥时候结婚呐？年薪多少买房了吗？你看隔壁小王都有俩娃了，ba la ba la
俩娃你M。彷徨着彷徨着，春节的脚步近了，七大姑八大姨的脚步也近了，单身的别慌、未婚也别紧张，不就是结婚这...
Concatenating two one-dimensional NumPy arrays
...en outweighs the time spent 'massaging' the input.
– n1k31t4
Mar 9 '18 at 18:29
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iOS开发调试技巧总结 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...时间，然后分析效率等问题，这个时候就需要执行时间是多少。正好看到网上已经有人做了这个工作，我就直接摘下来了。正好也用了宏的方式计算时间，我们只要在需要计算时间的代码块前后写上TICK,TOCK宏即可。当然，原理也...