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How to remove leading and trailing whitespace in a MySQL field?
... removes regular spaces and not other whitespace characters (tab, newline, etc)
– TM.
Jan 9 '14 at 20:50
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what is the difference between GROUP BY and ORDER BY in sql
...orm aggregation functions on non-grouped columns (such as SUM, COUNT, AVG, etc).
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What is a bus error?
...ler accept all address in its range which would suggest that when the BARs etc are changed, it would have to internally
– Lewis Kelsey
Mar 10 '19 at 5:00
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Is Zookeeper a must for Kafka?
...d to have some way to coordinating tasks, state management, configuration, etc across a distributed system. Some projects have built their own mechanisms (think of the configuration server in a MongoDB sharded cluster, or a Master node in an Elasticsearch cluster). Others have chosen to take advanta...
Best practices when running Node.js with port 80 (Ubuntu / Linode) [closed]
...quests to port 80 will get mapped to port 3000.
You should also edit your /etc/rc.local file and add that line minus the sudo. That will add the redirect when the machine boots up. You don't need sudo in /etc/rc.local because the commands there are run as root when the system boots.
Logs
Use the fo...
Why does GCC generate such radically different assembly for nearly the same C code?
...dern compilers" fill in the blank, do the best job, make the fastest code, etc. Actually I saw gcc get worse from 3.x to 4.x on arm at least. 4.x might have caught up to 3.x by this point, but early on it produced slower code. With practice you can learn how to write your code so the compiler doe...
How to upgrade PostgreSQL from version 9.6 to version 10.1 without losing data?
...is the solution for Ubuntu users
First we have to stop postgresql
sudo /etc/init.d/postgresql stop
Create a new file called /etc/apt/sources.list.d/pgdg.list and add below line
deb http://apt.postgresql.org/pub/repos/apt/ utopic-pgdg main
Follow below commands
wget -q -O - https://www.postg...
CentOS系统下如何挂载第2块磁盘 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...机器都要手动挂载。
设置开机自动挂载需要修改/etc/fstab文件
#vi /etc/fstab
在文件的最后增加一行
/dev/sdb1 /home ext3 defaults 1 2
PS：
fstab(/etc/fstab)是Linux下比较重要的配置文件，它包含了系统在启动时...
How do I change the IntelliJ IDEA default JDK?
...y management. I frequently build my project structure (directories, poms, etc) outside of IDEA and then import the project into IDEA using Import project from external model . This works great, except that in my poms I specify that the maven-compiler-plugin should use JDK 1.6, and when I import, ...
Convert HH:MM:SS string to seconds only in javascript
...defined input. For example: it's not a string, has no ":" or only "HH:MM". etc.
– Dominik
Sep 26 '17 at 14:09
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