Primary Key And Foreign Key In Sql Server

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 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 ...

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 ...

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 ..."

Xiaoman, one of China's Shiber. Every year from May 20 to 22nd, the sun reaches the yellow-diameter 60° as Xiaoman. The implication is that the grains of the Shahi crop begin to grout plump. Xiaoman season, everything is vigorous, rapid growth, breeding infinite hope. Shenzhen Xiaoman Technology Co., Ltd. (Xiaoman Technology) is an innovative Internet company designed to provide SaaS services and productivity tools for businesses through cloud computing. Mainly for small and medium-sized enterprises, to help customers improve their enterprise management level, improve sales force, resulting in sustained growth in performance, so that enterprises more onstage ...

There are a few things to explain about prismatic first. Their entrepreneurial team is small, consisting of just 4 computer scientists, three of them young Stanford and Dr. Berkeley. They are using wisdom to solve the problem of information overload, but these PhDs also act as programmers: developing Web sites, iOS programs, large data, and background programs for machine learning needs. The bright spot of the prismatic system architecture is to solve the problem of social media streaming in real time with machine learning. Because of the trade secret reason, he did not disclose their machine ...

Large Data Practitioner Market status: A huge gap in pay growth in the big data age, businesses are fighting to attract and retain professionals in business intelligence and information management. Large data workers face a huge gap in the payroll survey of IT employees published every year in InformationWeek. Today's large data presents a "4V + 1C" feature. Produced: generally includes the structure, the semi-structured and the unstructured and so on many kinds of data, and they processing and the analysis way has the difference; Volume: through various ...

Few people will deny that cloud computing is the most important it trend of the era, a few years ago people will ask what is cloud computing, cloud computing is the concept of speculation or the future direction of development? And now there is no doubt that cloud computing is the most important it change of the era. As the trend Technology chairman Zhang Ming said, cloud computing is like playing baseball, a total of nine levels, but we have now reached the second level. At the first level, we ask what is cloud computing, is cloud computing a trend? But now very few people ask this question, now more concerned about cloud applications, how to use to reduce the enterprise ...