Database Primary Key Foreign Key

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Delve into the primary key issues of SQL Server tables

The logical design of database is a very broad problem. In this paper, the main key design of the table is discussed in the design of MS SQL Server, and the corresponding solutions are given. Primary key design status and problems about database table primary key design, in general, based on business requirements, based on business logic, the formation of primary key. For example, when sales to record sales, generally need two tables, one is the summary description of the sales list, records such as sales number, the total amount of a class of cases, and the other table record of each commodity ...

How to define foreign key in MySQL

If a computer manufacturer, its database holds machine and accessories product information. The table used to save the whole product information is called pc; the table used to save the parts supply information is called parts. There is a field in the pc table, used to describe the type of CPU used in this computer; there is a field in the parts table, the description of the CPU model, we can think of it as a list of all CPU models. Obviously, the CPU used by this manufacturer must be a model that exists in the supply information sheet. At this time, two tables ...

Discussion on NoSQL database

With the rise of internet web2.0 websites, the relational database has become a very hot new field, the development of the non relational database products is very rapid.   But the traditional relational database in dealing with web2.0 website, especially the super large-scale and high concurrent SNS type web2.0 pure dynamic website already appeared to be powerless, has exposed many insurmountable problems, for example: 1, high configured--to the database higher concurrent reads and writes the demand WEB2.0 website to be based on user personalized information to generate real-time dynamic ...

What is a column-oriented open source distributed database HBase-products and Technologies

What is a column-oriented open source distributed database HBase release time: 2012.04.16 14:41 Source: News and Author: HBase is a distributed, column-oriented open source database, developed by the Apache Foundation. Unlike a generic relational database, HBase is a database suitable for unstructured data storage. It is based on a column rather than a row based pattern. User stores data ...

Second Lesson notes: Search engine basics and working principles

The intermediary transaction SEO diagnoses Taobao guest Cloud host technology Hall Everybody Good, I am specialized in the SEO, for several months has been in the maintenance and the Optimization massager list www.yziyuan.com This website, and has summed up a lot of experience and knowledge from it.   Today to share is "search engine basics and work principle", this is the most basic concept, the first part: What is a search engine?   1, definition? Official definition: Search engine refers to a certain strategy, the use of special ...

Talking about the steps of the primary webmaster's construction station

The intermediary transaction SEO diagnoses Taobao guest Cloud host Technology Hall 1. What keyword do you want to do well? As long as you can think of Chinese words can be used as a key word. Site do not do more than one keyword, a number of keywords too dispersed, a site to do one to two keywords is good, so easy to do up. Do site content can pick a good keyword, if this keyword no one to do, the unit price is high, it would be cool to death. But this is difficult, because almost all the keywords are discovered, can only pick some small competition, can be based on this keyword ...

The key to success or failure of the preferred virtual space personal website

Intermediary transaction http://www.aliyun.com/zixun/aggregation/6858.html ">seo diagnose Taobao guest cloud host technology Hall in recent years, with the development of the Internet and the popularization of network marketing, the establishment of personal websites, Promotion of network Marketing has been deep into people's lives and work, personal construction station has gradually become popular throughout the IT industry. Personal site by virtue of its construction at random, the management of freedom and other characteristics and quickly by many webmaster favorite. But after the construction of the website idea ...

Basic knowledge and working principle of search engine

Absrtact: Hello, I am specialized in SEO, for several months have been in the maintenance and optimization of the massage list www.yziyuan.com this site, and summed up a lot of experience and knowledge. Today to share is the "search engine basics and work principle", which is good, I am specialized in SEO, for several months has been in the maintenance and optimization of the massage list www.yziyuan.com this site, and summed up a lot of experience and knowledge. Today to share is "search engine basics and work principle", this is the most basic ...

Layout Big data controversy over the world's Top 14 data makers

The concept of large data, for domestic enterprises may be slightly unfamiliar, the mainland is currently engaged in this area of small enterprises. But in foreign countries, big data is seen by technology companies as another big business opportunity after cloud computing, with a large number of well-known companies, including Microsoft, Google, Amazon and Microsoft, that have nuggets in the market. In addition, many start-ups are also starting to join the big-data gold rush, an area that has become a real Red sea. In this paper, the author of the world today in the large data field of the most powerful enterprises, some of them are computers or the Internet field of the Giants, there are ...

College students ' business plan

Intermediary transaction SEO diagnosis Taobao guest Cloud host technology Hall with the rapid development of the information industry with Internet as the leading, a profound change is taking place in every field of society. Experts predict that within a few years, China will become the world's largest Internet users.  For the failure to keep up with the pace of the domestic campus network status quo, different "' net '" card ' one "mode of operation, perhaps another solution can be used for reference. A few passionate and intelligent young people on this "campus Easy Network" and "Campus Easy card ..."

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