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postgresql return 0 if returned value is null
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182
use coalesce
COALESCE(value [, ...])
The COALESCE function returns the first of its argume...
Dokan虚拟磁盘开发实战 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...了几天，发现只需要实现少数几个回调函数就可以了：
1.FindFiles: 在这个回调函数里可以实现从远程目录同步其下的所有目录及文件。当然也可以在OpenDirectory回调函数里做，但实际使用时我发现OpenDirectory调用太频繁，而FindFiles...
Mapping two integers to one, in a unique and deterministic way
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18 Answers
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What's the fastest way to loop through an array in JavaScript?
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edited Sep 19 at 3:34
ib.
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answere...
Python Infinity - Any caveats?
... usual arithmetic calculations:
>>> 2.0**2
4.0
>>> _**2
16.0
>>> _**2
256.0
>>> _**2
65536.0
>>> _**2
4294967296.0
>>> _**2
1.8446744073709552e+19
>>> _**2
3.4028236692093846e+38
>>> _**2
1.157920892373162e+77
>>> _**2...
Calculating Pearson correlation and significance in Python
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16 Answers
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How is “int* ptr = int()” value initialization not illegal?
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110
int() is a constant expression with a value of 0, so it's a valid way of producing a null poin...
New Array from Index Range Swift
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183
This works for me:
var test = [1, 2, 3]
var n = 2
var test2 = test[0..<n]
Your issue cou...
How to grant remote access to MySQL for a whole subnet?
...n as a wildcard in the IP address.
From http://dev.mysql.com/doc/refman/5.1/en/grant.html
You can specify wildcards in the host name. For example, user_name@'%.example.com' applies to user_name for any host in the example.com domain, and user_name@'192.168.1.%' applies to user_name for any host...