Mysql Cast Example

First, the importance of the index The index is used to quickly find a column in a particular value of the line. Instead of using an index, MySQL must start with the first record and then read the entire table until it finds the relevant row. The larger the table, the more time it takes. If the table in the query column index, MySQL can quickly reach a location to search the middle of the data file, there is no need to see all the data. Note that if you need to access most of the rows, sequential reads are much faster since we avoid disk searches. If you use Xinhua Dictionary to find "Zhang" the Chinese characters, do not use the directory, then ...

With the explosion of information, micro-blogging website Twitter was born. It is no exaggeration to describe Twitter's growth with the word "born". Twitter has grown from 0 to 66,000 since May 2006, when the number of Twitter users rose to 1.5 in December 2007. Another year, December 2008, Twitter's number of users reached 5 million. [1] The success of Twitter is a prerequisite for the ability to provide services to tens of millions of users at the same time and to deliver services faster. [2,3,4 ...

Cloudera's location is bringing big Data to the Enterprise with Hadoop Cloudera in order to standardize the configuration of Hadoop, you can help the enterprise install, configure, Run Hadoop to achieve large-scale enterprise data processing and analysis. Since it is for enterprise use, Cloudera's software configuration is not to use the latest Hadoop 0.20, but the use of Hadoop 0.18.3-12.clou ...

Hello everyone, I am from Silicon Valley Dong Fei, at the invitation of domestic friends, very happy to communicate with you about the U.S. Big Data Engineers interview strategy. Personal introduction to do a self-introduction, after the undergraduate Nankai, joined a start-up company Kuxun, do real-time information retrieval, and then enter the Baidu Infrastructure group, built the Baidu APP engine earlier version, and then went to Duke University, in the study, during the master's degree, Starfish, a research project related to Hadoop's big data, and then Amazon ...

The intermediary transaction SEO diagnoses Taobao guest stationmaster buys cloud host technology Hall June 21 3 o'clock in the afternoon, the Tianjin Software Industry Association internet application Branch Fifth week discussion meeting starts, the official QQ group: 39241075, this period discussion by stationmaster net www.admin5.com, 　　China red Www.admin5.com, China Red League www.redhacker.cn Cooperation, the theme: Network Security network intrusion. Interconnection Liu Weijun (old wheat 296128095) Hello! According to...

1. Who is doing big data marketing? Everyone says they are doing big data marketing. Based on: business: and marketing-related, so the government Office unit data is not considered. Volume: has enough valuable data. This is a lot of internet companies and traditional large enterprises can meet.     Technology: Technical ability to handle large data. Above 3 factors, the domestic can enlarge the data marketing really only bat three.     Foreign unfamiliar, here do not talk. As we all know, three ...

The intermediary transaction SEO diagnoses Taobao guest Cloud host technology Hall in understanding the Internet entrepreneurship Theory knowledge, began the field to carry out the actual operation of the website business. 　　In this chapter, we will explain in detail how to build a Web site that conforms to the user experience. First, the site's page planning and style design, the choice of the website programming language third, the choice of website database four, the Web site's hardware requirements and preparation of five, server hosting and maintenance six, server performance test seven, domain name query and registration eight, the actual combat exercise ...

The intermediary transaction SEO diagnoses Taobao guest Cloud host Technology Hall This article Doseo the system the introduction novice from constructs the website to the implementation Network marketing concrete step, avoids the disorderly operation to affect the construction station time and the efficiency, the article suits the individual and the small and medium-sized enterprise to optimize as the main promotion way reader. The first step, the preparatory work before the station first in the need to build a station, to begin to clear the purpose of the site construction. What is the theme of the website? is to carry out a comprehensive discussion of an industry to promote their own, or simply released ...

&http://www.aliyun.com/zixun/aggregation/37954.html ">nbsp; WEB2.0 's popularity led to the development of classified information, from the earliest imitation of the Craigslist platform, to Wang Jianyue guests, the decline of the portal 263 transformation to do the classification, Alibaba investment Word-of-mouth network to the Flying Pigeon Book network repeatedly by the capital giant coveted, net alliance Google and so on, Classified information in just over a year's time ...