Database Keys Explained

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 ...

The buzzword in the IT industry in 2011 is "cloud computing." Currently, the security issue is the biggest concern of cloud computing applications. The 4th China CIO Annual Meeting on the theme of "Wisdom in the Cloud" was held on December 15, 2011 and was hosted by the Internet and IT experts. In the afternoon information security forum, information security issues were raised Discussion, from users, vendors and third-party experts to discuss this topic, especially the topic of cloud security. The biggest concern for users choosing a cloud application is often security, but in reality cloud computing is more secure than us ...

Tianya, the most famous Chinese community in the world, has been carrying the "colorful" of Chinese society in the form of forum. In the current era of information dissemination without Borders, Tianya is undoubtedly a strong position of public opinion, but also a brand of public opinion, how many major social events, how many times the transmission of social love, how many back to the fiery social topic of discussion, I think has been countless, They give us a clear sense of Tianya's position and influence in China's internet world. Along with this position and influence comes the huge amount of traffic, and the accumulated data, ...

"Editor's note" even seemingly simple data center migrations can affect business operations, jeopardizing key business functions and business relationships. However, the company can successfully migrate the data center. Greenhousedata's data center and Planning Director Art Salazar recently wrote about the four steps to do a good job of data center migration, with a lot of people concerned and learning. With the company merging, the internal deployment facilities are aging, but the integration task has been confessed, then the need to migrate the data center equipment to the new facility ...

Intermediary transaction SEO diagnosis Taobao guest Cloud host technology Hall 1, Chinese "information" the earliest source of the word no doubt, "etymology" is the best starting point for retrieval. Considering that we don't have a lot of reference books on hand, Google is the suboptimal choice for the starting point of the search. The machine is not a person, I will not directly in the search box input "The word of information from where first" to ask it. First Use 4 key words "The first word of information from" to test the search. Turned 2 pages, the first 20 pages seem to have none. If you write an article to the earliest source of information, it is estimated that ...

25 years later, computer, network, and storage systems are tens of thousands of times times faster than today's, and science fiction applications will become a reality, with 80% of the advanced applications benefiting from cloud computing. Experts said that 25 years later IT industry innovation will intensify, man-machine dialogue, 3D Cisco Network Real and Real world robot development will change rapidly, triggering the overhaul of various industries, including health care, urban planning, energy, electronic retailing and entertainment. Cisco's chief future figuratively futurist David Evans (Dave E ...)

The intermediary transaction SEO diagnoses Taobao guest cloud host technology Hall Long Tail theory is the famous Wired magazine editor Chris Anderson in 2004 began in the Wired magazine series and later published in the "Long Tail" of the book specifically elaborated. 　　Chris Anderson studied the consumer data of the Amazon bookstore, Google, and Netflix, the online video rental website, and came up with the long tail theory. Long tail theory, the so-called long tail theory, refers to when the commodity storage, circulation, display ...