Floating Point Data Type

Either in the pitiful free database space or large e-commerce sites, reasonable design table structure, make full use of space is very necessary. This requires that we have a full understanding of the commonly used MySQL data types for database systems. Now I will write down my little experience to share with you. The numeric type of the MySQL data type The numeric type is divided into three categories according to my classification: integer classes, decimal classes, and numeric classes. My so-called "digital class" refers to DECIMAL and NUMERIC, which are the same type. It is strictly speaking not ...

In the early April, star fund manager Wang Yawei a few public appearances, talking about the issue of the reform of the IPO system.　　At the same time, the new shares break from the case gradually into the entire capital market trend. Wind data show that as of Friday, 2011 a total of 101 shares listed, of which 49 new shares have fallen below the IPO price, break rate reached 48.5%. This means that the institutions that are keen on this are already losing money in nearly half their new "investment".　　In particular, some habits rely on the new gains in the interest of the bond-type funds, floating deficit has reached tens of millions of dollars. New shares ...

Preface: Since 2010 into the company 2.5 of the time, I have been responsible for advertising platform Department of product design. From unfamiliar to familiar, unconsciously I have to these products into the feelings ... Analysis of the features of tool-type web site million change and not from its case around two key words in the unfolding of their respective plots, that is: function and data. So talk to "experience", in fact, the design goal is more clear and clear--1. On the basis of ensuring the smooth completion of the function flow, let the user feel more comfortable; 2. In the face of a lot of data, let the user relaxed ...

In 2017, the double eleven refreshed the record again. The transaction created a peak of 325,000 pens/second and a peak payment of 256,000 pens/second. Such transactions and payment records will form a real-time order feed data stream, which will be imported into the active service system of the data operation platform.

Introduction Usually, we can through the user interview method to understand the needs of users, in fact, designers can also analyze the user survey data and Web page data, and other ways to understand the user needs and users in the use of products encountered problems. Moreover, the direct contact with the user to understand the demand may only be a case, in order to enhance objectivity, usually through large sample survey, from the perspective of empirical data, further more accurate and objective to find the general needs of users. In addition, through the data analysis results and user interviews of the qualitative analysis of the conclusions, comparative and comprehensive analysis, ...

Today, the concept of big data has flooded the entire IT community, with a variety of products with large data technologies, and a variety of bamboo seen for processing large data tools like rain. At the same time, if a product does not hold the big data of the thigh, if an organization has not yet worked on Hadoop, Spark, Impala, Storm and other tall tools, will be the evaluation of obsolete yellow flowers. However, do you really need to use Hadoop as a tool for your data? 　　Do you really need large data technology to support the data type of your business processing? Since it is ...

The intermediary transaction SEO diagnose Taobao guest Cloud host technology Hall a lot of friends engaged in the network at first are interested in SEO, even think SEO is similar to the decision technology of hackers, SEO is always so mysterious, unfathomable ... Engaged in "website production" cause friends know how important SEO to the site, in fact, rather than SEO (search Engine optimization, search engine optimization) than to say Sem (search Engine marketin ...

How to understand the needs of users? Generally, through the user interview method we can understand the needs of users, but also through the analysis of user survey data and Web page data, and other ways to understand the user needs and users in the use of products encountered problems. 　　Not only that, directly through contact with the needs of users, in order to enhance objectivity, usually through a large sample survey, from the perspective of empirical data, further more accurate and objective to find the general needs of users. Not only that, we can also through the data analysis results and user interviews with the qualitative analysis of the knot ...

Here is a translation of the Redis Official document "A fifteen minute introduction to Redis data Types", as the title says, The purpose of this article is to allow a beginner to have an understanding of the Redis data structure through 15 minutes of simple learning. Redis is a kind of "key/value" type data distributed NoSQL database system, characterized by high-performance, persistent storage, to adapt to high concurrent application scenarios. It started late, developed rapidly, has been many ...

Big data is mainly not judged by causality and is mainly applicable to correlation analysis. Many correlation analyses do not require complex models and only require awareness of big data.