大约有 5,600 项符合查询结果（耗时：0.0283秒） [XML]
Which is fastest? SELECT SQL_CALC_FOUND_ROWS FROM `table`, or SELECT COUNT(*)
... a query with 4 joins on a 168,000 row database. Selecting just the first 100 rows with a SQL_CALC_FOUND_ROWS took over 20 seconds; using a separate COUNT(*) query took under 5 seconds (for both count + results queries).
– Sam Dufel
Jul 11 '12 at 23:59
...
程序员：编程能力与编程年龄的关系 - 杂谈 - 清泛网 - 专注C/C++及内核技术
...倍，所以更能反映程序员的真实水平。
Reputation声望在2-100K之间。(注：StackOverflow的用户Reputation是得到社会认可的，在面试和招聘中是硬通货币。比大学的学分更有价值)
上述的条件一共过滤出84,248名程序员，平均年龄：29.02岁...
Why is require_once so bad to use?
....046600103378296
require_once 1.2219581604004 3.2908599376678
10-100× slower with require_once and it's curious that require_once is seemingly slower in hhvm. Again, this is only relevant to your code if you're running *_once thousands of times.
<?php // test.php
$LIMIT = 1000000;
...
How does Facebook Sharer select Images and other metadata when sharing my URL?
...t;a class="btn" target="_blank" href="http://www.facebook.com/sharer.php?s=100&amp;p[title]=<?php echo urlencode(YOUR_TITLE);?>&amp;p[summary]=<?php echo urlencode(YOUR_PAGE_DESCRIPTION) ?>&amp;p[url]=<?php echo urlencode(YOUR_PAGE_URL); ?>&amp;p[images][0]=<?php...
int value under 10 convert to string two digit number
...rmat is worth a try:
var str1 = "";
var str2 = "";
for (int i = 1; i < 100; i++)
{
str1 = String.Format("{0:00}", i);
str2 = String.Format("{0:000}", i);
}
For the i = 10 case:
str1: "10"
str2: "010"
I use this, for example, to clear the text on particular Label Controls on my ...
Run an OLS regression with Pandas Data Frame
...py as np
# data
np.random.seed(123)
df = pd.DataFrame(np.random.randint(0,100,size=(100, 3)), columns=list('ABC'))
# assign dependent and independent / explanatory variables
variables = list(df.columns)
y = 'A'
x = [var for var in variables if var not in y ]
# Ordinary least squares regression
mo...
Why are margin/padding percentages in CSS always calculated against width?
...if you specify their width to be larger. Typical block elements are width 100% and expand automatically in the vertical direction (unknown). That's why width doesn't have the same problem.
– Lucent Fox
Oct 18 '16 at 20:00
...
How to calculate the CPU usage of a process by PID in Linux from C?
...te the CPU usage of the process over the sampling time, with:
user_util = 100 * (utime_after - utime_before) / (time_total_after - time_total_before);
sys_util = 100 * (stime_after - stime_before) / (time_total_after - time_total_before);
Make sense?
...
How to center horizontally div inside parent div
...
<div id='parent' style='width: 100%;text-align:center;'>
<div id='child' style='width:50px; height:100px;margin:0px auto;'>Text</div>
</div>
share
|...
Reduce git repository size
...
In my case, I pushed several big (> 100Mb) files and then proceeded to remove them. But they were still in the history of my repo, so I had to remove them from it as well.
What did the trick was:
bfg -b 100M # To remove all blobs from history, whose size is su...