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Getting random numbers in Java [duplicate]
I would like to get a random value between 1 to 50 in Java.
2 Answers
2
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What is the performance of Objects/Arrays in JavaScript? (specifically for Google V8)
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+100
I created a test suite, precisely to explore these issues (and more) (archived copy).
And in that sense, you can see the performance...
Export database schema into SQL file
Is it possible in MS SQL Server 2008 to export database structure into a T-SQL file?
4 Answers
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OceanBase使用libeasy原理源码分析：服务器端 - 数据库(内核) - 清泛网 - ...
...y基于libev，对libev不了解的参见 这
这篇主要分析OceanBase 0.4的mergeserver使用libeasy作为服务器端的模式，客户端自然就是MySQL客户端。OceanBase仅仅使用了libeasy的IO线程部分，工作线程是使用了我们自己的线程池。
主要说如下几个...
How to pad zeroes to a string?
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2506
Strings:
>>> n = '4'
>>> print(n.zfill(3))
004
And for numbers:
>>&...
How can I ensure that a division of integers is always rounded up?
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670
UPDATE: This question was the subject of my blog in January 2013. Thanks for the great question!...
Add a new element to an array without specifying the index in Bash
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edited Dec 23 '09 at 9:18
answered Dec 23 '09 at 9:02
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Combine two columns of text in pandas dataframe
I have a 20 x 4000 dataframe in Python using pandas. Two of these columns are named Year and quarter . I'd like to create a variable called period that makes Year = 2000 and quarter= q2 into 2000q2 .
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COUNT DISTINCT with CONDITIONS
...count(distinct tag) as tag_count,
count(distinct (case when entryId > 0 then tag end)) as positive_tag_count
from
your_table_name;
The first count(distinct...) is easy.
The second one, looks somewhat complex, is actually the same as the first one, except that you use case...when clause. In ...
GraphViz - How to connect subgraphs?
...ue statement is required.
digraph G {
compound=true;
subgraph cluster0 {
a -> b;
a -> c;
b -> d;
c -> d;
}
subgraph cluster1 {
e -> g;
e -> f;
}
b -> f [lhead=cluster1];
d -> e;
c -> g [ltail=cluster0,lhead=cluster1];
c -> e [...