大约有 47,000 项符合查询结果(耗时:0.0378秒) [XML]
Sass and combined child selector
...
edited Apr 30 '15 at 22:58
Continuity8
1,41322 gold badges1414 silver badges2828 bronze badges
answered...
Troubleshooting “Illegal mix of collations” error in mysql
...
|
edited Feb 28 '18 at 12:41
Sae1962
1,0201212 silver badges2727 bronze badges
answered Jun ...
It is more efficient to use if-return-return or if-else-return?
...
8 Answers
8
Active
...
What does “@@ -1 +1 @@” mean in Git's diff output?
...odification-time
The time stamp looks like 2002-02-21 23:30:39.942229878 -0800 to indicate the date, time with fractional seconds, and time zone. The fractional seconds are omitted on hosts that do not support fractional time stamps.
You can change the header's content with the --label=la...
Converting a column within pandas dataframe from int to string
...t('AB'))
In [17]: df
Out[17]:
A B
0 0 1
1 2 3
2 4 5
3 6 7
4 8 9
In [18]: df.dtypes
Out[18]:
A int64
B int64
dtype: object
Convert a series
In [19]: df['A'].apply(str)
Out[19]:
0 0
1 2
2 4
3 6
4 8
Name: A, dtype: object
In [20]: df['A'].apply(str)[0]
Out[...
How to fix the uninitialized constant Rake::DSL problem on Heroku?
...ant Rake::DSL
– David
Jun 20 '11 at 8:05
2
I got the error deploying to Heroku, which today pulle...
How to convert floats to human-readable fractions?
...ational approximation to given real number
** David Eppstein / UC Irvine / 8 Aug 1993
**
** With corrections from Arno Formella, May 2008
**
** usage: a.out r d
** r is real number to approx
** d is the maximum denominator allowed
**
** based on the theory of continued fractions
** if x = a1 + 1...
What is the best collation to use for MySQL with PHP? [closed]
...ng characters in the language) and performance. The only special one is utf8_bin which is for comparing characters in binary format.
utf8_general_ci is somewhat faster than utf8_unicode_ci, but less accurate (for sorting). The specific language utf8 encoding (such as utf8_swedish_ci) contain additi...
Detect Windows version in .net
... | Win32Windows | 4 | 0 |
| Windows 98 | Win32Windows | 4 | 10 |
| Windows Me | Win32Windows | 4 | 90 |
| Windows NT 4.0 | Win32NT | 4 | 0 ...
What is the memory consumption of an object in Java?
...
183
Mindprod points out that this is not a straightforward question to answer:
A JVM is free to...