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  Removing duplicates in sql

In modern web development, it’s standard practice to make use of a database abstraction layer, typically an Object-Relational Mapper based on either the Active Record pattern or the Data Mapper pattern. There are several pros and cons to this which are fairly well established, so I’ll spare us all from enumerating them all right now. One established pro worth mentioning is that these systems typically provide a high level interface for fetching data, often removing the need to ...

   SQL,Duplicate,Remove,Web design     2012-01-05 08:20:13

  Is 99.8% Secure Secure?

A group of researchers (Arjen Lenstra and collaborators  from EPFL Lausanne and James Hughes from Palo Alto) published a study, Ron was wrong Whit is right, of new vulnerabilities of cryptosystems. The New York Times picked up the story. Although Lenstra et al discuss several cryptosystems, their results are particularly relevant to those based on RSA. The title mirrors their conviction that cryptosystems based on a single random element have fewe...

   Security,Percentage,Security index     2012-02-27 04:48:06

  4 types of programmers

Not every one who writes code is a programmer. Programmers are people who live with programming. There are 4 types of programmers: scientist, coder, expert and artisan.Scientist, they are more like mathematicians rather than programmers. They invented various theories, algorithms and terminologies. Proofs and calculations in textbooks are all from these people. Moreover other programmers more or less benefit from their work. Sometimes one paper published by them can change the way of thinking of...

   Programmer,Coder,Expert     2013-07-13 09:19:03

  How does Base64 work

Base64 is a data encoding scheme used in safe data transfer such as HTTP and its extensions. Base64 encoding can conver arbitrary group of bytes into a sequence of readable ASCII characters. These converted characters can safely put in a HTTP header without causing any problem while the peers process the HTTP header. Base64 encoding was invented as part of the MIME content transfer encoding. It is similar to other encoding schemes such as Uuencode and BinHex but with higher efficiency....

   ALGORITHM,BASE64     2016-03-09 23:47:40

  Kicking ass together: How to improve coding skills as a group

Over the last year and a half, I have worked with a small group of students and staff to create an excellent online learning community at Mendicant University. Unfortunately, because Mendicant is something that we’re intentionally scaling at a very slow pace, we won’t directly reach as many people as we’d like to any time soon. In this post, I’ve collected some of the things that I think contribute to making Mendicant University a great place to learn. I’d love...

   Code skill,Group,Improvement,Efficiency     2012-01-31 23:59:33

  Install Kubernetes with minikube and docker on Ubuntu

When someone just wants to play around Kubernetes on its local environment without accessing to Cloud provider resources, one can set Kubernetes up on local environment with minikube with single node mode. This post will provide a simple guideline on how to set up KUbernetes with minikube and docker on Ubuntu. Before all the steps can be started, you may need to first set up kubectl which is a command line tool to operate on Kubernetes resources. Post that, can ensure that docker is installed on...

   KUBERNETES,MINIKUBE,DOCKER,UBUNTU     2021-06-01 05:37:40

  Select top 3 values from each group in a table with SQL

Yesterday, my friend Liu Bing asked me a question about how to select top 3 values for each person in a database table using SQL. I think this question is interesting and it deserves some thoughts. Here I record down how to solve this issue. Assume we have a table which has two columns, one column contains the names of some people and the other column contains some values related to each person. One person can have more than one value. Each value has a numeric type. The question is we want to se...

   SQL,Correlated query,top 3     2013-05-23 03:21:25

  Alibaba pays all cash to acquire Youku Tudou

Alibaba announced that it had signed the agreement to acquire "China's YouTube" YouKu Tudou on November 6 Beijing Time. This deal will make Alibaba the leading entertainment and media company in China. The highlight of this deal is that Alibaba will pay all cash. When this acquisition is completed, shareholders from Youku Tudou can get cash with $27.60 per ADS. The board has approved this acquisition and they are asking the shareholders to vote to approve this deal. This deal is expected to be ...

   CHINA,ALIBABA,YOUKU,NEWS     2015-11-06 20:26:31

  Java 9 release is delayed again

The original Java 9 planned release date is March 2017. But latest source shows that Java 9 release will be delayed again to July 2017. It's four months later than the planned date. Oracle Chief Architect of Java Platform group Mark Reinhold proposes this new release date in a message sent on the OpenJDK mailing list.  Despite this progress, at this point it's clear that Jigsaw needs more time. We recently received critical feedback that motivated a redesign of the module ...

   JAVA,RELEASE DATE,JAVA 9,JAVA 9 DELAY     2016-09-26 12:22:53

  Former Microsoft Executive Vice President Qi Lu joins Baidu

Former Microsoft Executive Vice President Qi Lu joined Baidu(The largest search engine in China) on January 1, 2017. Qi will be group president and COO at Baidu. He will be in charge of Baidu's products, technology, sales and marketing and operations. And he will be the second most powerful person in Baidu just behind Robin Li, the founder and CEO of Baidu. At the same time, Robin Li will step away from daily operation of Baidu. In a statement, Robin Li said “Dr. Lu possesses a ...

   MICROSOFT,CHINA,BAIDU,NEWS,QI LU     2017-01-18 08:53:42

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