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Grouped LIMIT in PostgreSQL: show the first N rows for each group?
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287
New solution (PostgreSQL 8.4)
SELECT
*
FROM (
SELECT
ROW_NUMBER() OVER (PARTITION BY...
How to deal with SettingWithCopyWarning in Pandas?
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879
The SettingWithCopyWarning was created to flag potentially confusing "chained" assignments, su...
Unique combination of all elements from two (or more) vectors
... ABC 2012-05-02
5 DEF 2012-05-02
6 GHI 2012-05-02
7 ABC 2012-05-03
8 DEF 2012-05-03
9 GHI 2012-05-03
10 ABC 2012-05-04
11 DEF 2012-05-04
12 GHI 2012-05-04
13 ABC 2012-05-05
14 DEF 2012-05-05
15 GHI 2012-05-05
If the resulting order isn't what you want, you can sort afterwards. If...
how to check the jdk version used to compile a .class file [duplicate]
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638
You're looking for this on the command line (for a class called MyClass):
On Unix/Linux:
javap...
How do I create a list of random numbers without duplicates?
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185
This will return a list of 10 numbers selected from the range 0 to 99, without duplicates.
imp...
How to make the tab character 4 spaces instead of 8 spaces in nano?
When I press TAB in nano editor, the cursor will jump with 8 spaces like this:
6 Answers
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Error :: duplicate files during packaging of APK
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8 Answers
8
Active
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Unique (non-repeating) random numbers in O(1)?
...s off at 10:
+--+--+--+--+--+--+--+--+--+--+--+
| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9|10|
+--+--+--+--+--+--+--+--+--+--+--+
^
max
At each iteration, a random number r is selected between 0 and max, array[r] and array[max] are swapped, t...
windows C++ gbk转为utf-8 - C/C++ - 清泛网 - 专注C/C++及内核技术
windows C++ gbk转为utf-8在windows与linux系统通过socket的传输数据里，如果传输中文字符，因为windows和linux使用的编码不同,所以需要将windows下的中文编码转换为 在windows与linux系统通过socket的传输数据里，如果传输中文字符，因为windo...
Replacing a 32-bit loop counter with 64-bit introduces crazy performance deviations with _mm_popcnt_
...-std=c++0x -O3 -save-temps -march=native
Ubuntu 12
Different Registers: 18.6195 GB/s
.L4:
movq (%rbx,%rax,8), %r8
movq 8(%rbx,%rax,8), %r9
movq 16(%rbx,%rax,8), %r10
movq 24(%rbx,%rax,8), %r11
addq $4, %rax
popcnt %r8, %r8
add %r8, %rdx
popcnt %r...