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  How MySQL optmizes ORDER BY

In some situations, MySQL will just use an index to fulfill the requirement of an ORDER BY or GROUP BY statement without extra sorting. Although ORDER BY will not have the exact match with index, index can still be used as long as the portion that is not included in the index is included in the where clause. The following queries will all use index to process the ORDER BY or GROUP BY part: SELECT * FROM t1 ORDER BY key_part1,key_part2,... ;SELECT * FROM t1 WHERE key_part1=constant ORDER BY key_p...

   MySQL,index,ORDER BY,optimization     2012-11-13 11:01:05

  Why 102 years for Alibaba

In many occasions, Alibaba Group Founder Jack Ma expresses the idea that he wanted Alibaba to be live for 102 years(a strange number). But why 102 years, but not 100 years or some other years?  In an interview conducted by Stanford University, the interviewer, Yahoo Founder Jerry Yang, asked this question why Jack Ma wanted Alibaba to live 102 years. Jack Ma gave his answer to this question. "In China, everybody wanted to make a company last over 100 years. This becomes a slogan, nobody ta...

   JACK MA,ALIBABA,STANFORD UNIVERSITY,JERRY YANG     2016-02-24 09:46:47

  Language Complexity?

Some languages are complex, others are simple … right?  C++ versus just about anything else is a good example here.  But, it begs the question: what makes a language complex? So, I’ve just been reading Bruce Eckel’s Artima article on Scala.  It’s actually a nice article, and I enjoyed it.  But, one thing bugged me — and, it’s nicely summarised in this quote: But you can see from the code above that learning Scala should be a lot eas...

   Programming language,complexity     2011-06-15 02:16:05

  Shortest command on Linux

Usually when we log in to a Linux system,. we may type some frequently used Linux commands such as pwd,ls, ps etc. All these commands are really simple but powerful with different options. But do you know what is the shortest command on Linux? The answer is w. According to Linux manual, w will show who is logged on and what they are doing on the system. w displays information about the users currently on the machine, and their processes. The header shows, in this order, the current time, how l...

   Linux,w,shortest command     2014-04-30 11:07:38

  How IoT is Challenging The World of "Smart" Cars

Smart cars have long been the subject of optimism in the auto industry, with their suites of advanced driver assistance and road safety features. Handy as they are, however, their convenient systems come with a substantially higher price tag. For now, however, many car owners are opting into a cheaper, more modular way to enhance their driving experience: a network of IoT devices. This makes it so that even pre-loved cars can enjoy the same features as smart cars. While IoT remains small at the...

   HARDWARE,IOT,CAR     2020-03-09 07:42:26

  Turn Your Visitors Into Shoppers With Responsive Magento Website

In recent years, there has been an influential growth in the number of internet users across the world. If statistics are to be believed, almost 83% of the web users are engaged over smart devices like Tablets, Mobiles, Ipads, Laptops, Desktop, etc. In 2008, the core community of Magento released a spellbinding web development solution i.e Responsive Magento Website to uniformly serve the target audience. Due to technological advancement in digital realm, there has been a splurged introduction o...

   MAGENTO DEVELOPERS,RESPONSIVE WEBSITE     2015-10-13 01:50:26

  Never create Ruby strings longer than 23 characters

Looking at things through a microscopesometimes leads to surprising discoveries Obviously this is an utterly preposterous statement: it’s hard to think of a more ridiculous and esoteric coding requirement. I can just imagine all sorts of amusing conversations with designers and business sponsors: “No… the size of this <input> field should be 23… 24 is just too long!” Or: “We need to explain to users that their subject lines should be les...

   Ruby,Specification,String,Interpreter,Optimization,23     2012-01-05 07:58:07

  Java Doesn't Need to Be So Bad

I do a lot of Java coding and I enjoy it. I admit that there is a lot of typing, often a lot of boilerplate and getting even simple tasks done can involve too much work. Most of the tools that try to fix these problems trade one moment saved for another lost. Maven's XML based configuration file is a good example: Thank you for making my project easier to manage and I won't forget that you made me edit XML to do so. These are the things that you live with, these are the things you trade for ...

   Java,Coding,Enterprise application,Tedious     2011-12-09 07:50:20

  Use rsync to delete mass files quickly in Linux

Yesterday I encountered an issue to delete many log files in my Linux workstation, there were around 100,000 files to be deleted. These are log files and they grow very fast, and we need to delete them frequently. Usually we would use rm -rf * to delete these files, but we may need to wait for a relative long time if there are too many files. So we must adopt some unusual way. Fortunately, we can use rsync to delete mass files in one shot. 1. Install rsync yum install rsync 2. Create a new empty...

   rsync,delete file, demo     2012-11-13 10:44:50

  Why Microsoft chooses Alt+F4 to close a window

For a long time, there is a doubt among lots of Windows users especially those English speaking users, that is why Microsoft chooses Alt+F4 to close a window instead of Alt+Q. Alt+Q is more comfortable to press for many keyboards, also Q represents Quit and it is easier for people to understand. Recently Microsoft answered this doubt. Raymond Chen, longtime Microsoft developer and semi-official Windows historian, said the reason is that not everyone speaks English. It d...

   WINDOWS,MICROSOFT,HISTORY,ALT+F4     2016-02-23 09:56:41

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