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What is float in Java?
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180
In Java, when you type a decimal number as 3.6, its interpreted as a double. double is a 64-bi...
MySQL - Using COUNT(*) in the WHERE clause
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271
try this;
select gid
from `gd`
group by gid
having count(*) > 10
order by lastupdated desc
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海量数据相似度计算之simhash短文本查找 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...。但是随着业务的增长 simhash的数据也会暴增，如果一天100w，10天就1000w了。我们如果插入一条数据就要去比较1000w次的simhash，计算量还是蛮大，普通PC 比较1000w次海明距离需要 300ms ，和5000w数据比较需要1.8 s。看起来相似度计算...
How to pass event as argument to an inline event handler in JavaScript?
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171
to pass the event object:
<p id="p" onclick="doSomething(event)">
to get the clicked ...
Rotation methods deprecated, equivalent of 'didRotateFromInterfaceOrientation'?
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edited Nov 4 '14 at 0:57
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How do you list all triggers in a MySQL database?
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152
The command for listing all triggers is:
show triggers;
or you can access the INFORMATION_S...
What is “rvalue reference for *this”?
Came across a proposal called "rvalue reference for *this" in clang's C++11 status page .
3 Answers
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xUnit.net: Global setup + teardown?
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118
As far as I know, xUnit does not have a global initialization/teardown extension point. Howeve...
How do I check if an object has a specific property in JavaScript?
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1447
I'm really confused by the answers that have been given - most of them are just outright inco...
Warning: mysql_connect(): [2002] No such file or directory (trying to connect via unix:///tmp/mysql.
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17 Answers
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