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Multiple Updates in MySQL
... DUPLICATE KEY UPDATE.
Using your example:
INSERT INTO table (id,Col1,Col2) VALUES (1,1,1),(2,2,3),(3,9,3),(4,10,12)
ON DUPLICATE KEY UPDATE Col1=VALUES(Col1),Col2=VALUES(Col2);
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Why doesn't GCC optimize a*a*a*a*a*a to (a*a*a)*(a*a*a)?
...application. One thing I noticed is that GCC will optimize the call pow(a,2) by compiling it into a*a , but the call pow(a,6) is not optimized and will actually call the library function pow , which greatly slows down the performance. (In contrast, Intel C++ Compiler , executable icc , will ...
How to know which version of Symfony I have?
I know that I have downloaded a Symfony2 project and started with but I have updated my vendor several times and I want to know which version of symfony I have
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Default function arguments in Rust
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edited Mar 24 '19 at 21:20
answered Jun 5 '14 at 0:06
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CentOS+Nginx+PHP+MySQL详细配置(图解) - 更多技术 - 清泛网 - 专注C/C++及内核技术
... //启动MySQL
#/usr/local/mysql/bin/mysqladmin -u root password 123456 //设置MySQL密码
#cp support-files/my-medium.cnf /etc/my.cnf
#echo "/usr/local/mysql/bin/mysqld_safe &" >>/etc/rc.local
二、安装PCRE
PCRE是perl所用到的正则表达式，目的是让所装...
Facebook API “This app is in development mode”
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205
I know its a little bit late but someone may find this useful in future.
STEP 1:
Login to fa...
Using SSH keys inside docker container
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answered Feb 8 '17 at 22:57
Daniel van FlymenDaniel van Flymen
7,88733 gold badges1919 silver badges3232 bronze badges
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What is a pre-revprop-change hook in SVN, and how do I create it?
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Basically it's a script that is launched before unversioned property is modified on the reposito...