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Database? The range seems to be very wide! It depends on what database you want to learn, and what language you are learning, and the database is relatively simple, and the problem is to do more, and if you do more, you will .........I don't seem to have heard of databases, there are also authoritative and non-authoritative dizziness, it's too exaggerated, let's practice it more Find a book related to the language you ...... learnedThen it's a matter of practice.
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Since its establishment in 1952, the Machinery Industry Press has adhered to the direction of scientific research, popular science and teaching services, guided by the two strategies of marketization and internationalization, while maintaining the leading position in the traditional electromechanical book market, it has adjusted and formulated new development strategies in a timely manner according to social needs, market changes and its own advantages, and has now developed into a large-scale comprehensive publishing house with multiple fields and disciplines.
In the process of development, the product system of the Machinery Industry Press has been continuously improved, extending from the traditional book publishing to the integration of books, periodicals, electronic publications and e-commerce, involving machinery, electrical and electronics, automobiles, computers, economic management, architecture, ELT, popular science and teaching materials and teaching aids. Over the past 50 years, it has published and sold 100 million books, and in recent years, it has maintained an annual publication of about 3,000 books, including more than 1,800 new books, 1,200 reprints, and nearly 400 million yuan in sales. At the same time, by using the rapid feedback system covering the marketing network of large and medium-sized cities including Taiwan, Hong Kong and Macao, our books have always maintained the record of ranking first in the domestic retail market share, and are well-known in China for their indisputable academic authority.
At present, it has a database of 100,000 professional readers, as well as basic information such as teacher database and library database, which is constantly supplemented and improved.
As early as 1995, China Machine Press began to embark on the road of international cooperative publishing, not only maintaining a good, stable and long-term strategic cooperative relationship with famous multinational publishing groups, but also having close professional and technical cooperation with many professional publishing groups.
With China's accession to the WTO and the continuous changes in the international market, the Machinery Industry Press has built a solid development platform for the formation of a large-scale publishing group across regions and ownership systems through various forms of strong alliances such as joint ventures, holding and equity participation.
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Everyone's abilities are different.
How much do you have?
At least live yourself well.
to have the ability to give to others.
I don't have the ability to live well.
How can they have the power to give to others?
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Well, it feels like that, it's good, it's just a good reflection on my life.
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The value of a person is not how much you have, but how much you can help others, so that you yourself are very happy.
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First, the establishment time is different.
1. CNKI was initiated by Tsinghua University and Tsinghua Tongfang, and was founded in June 1999.
2. VIP was founded in 2000.
3. Wanfang Database "Chinese Enterprises, Companies and Products Database" was founded in 1988.
Second, the positioning is different.
1. CNKI is an informatization construction project with the goal of realizing the dissemination, sharing and value-added utilization of knowledge resources in the whole society, adopting self-developed digital library technology with international leading level, and officially launching the construction of "China Knowledge Resources Database" and CNKI grid resource sharing platform.
2. VIP is the world's famous Chinese professional information service**, as well as China's largest comprehensive document service**.
3. Wanfang database is a large-scale network database developed by Wanfang Data Company, covering journals, conference minutes, academic achievements, and academic conferences;
Third, the content resources are different.
1. CNKI's services include:
1) China Knowledge Resources Database: Provide CNKI source database, foreign language, industry, agriculture, medicine and health, economics and education;
2) Digital publishing platform: provide professional digital libraries and industry libraries. The personalized service platform consists of personal digital library, institutional digital library, digital learning platform, etc.
3) Literature data evaluation: the main statistical contents include: a. the number of literature published in more than 7,000 academic journals of natural sciences and social sciences officially published in China and their classification statistical table; b. The number of citations, citation links and their classification statistics of each journal; c. Statistical table of the number of articles published by journal authors, citations and their institutions; d. CNKI Center** access volume and IP address statistics table.
2. The service content of VIP network includes:
VIP has been committed to scientific and rigorous research, analysis, collection, processing and other in-depth development and promotion of massive newspaper and periodical data. At present, the company's business scope has involved database publishing and distribution, knowledge network dissemination, periodical distribution, electronic journal production and distribution, network advertising, literature digital engineering and a variety of personalized services based on electronic information resources.
3. Wanfang database services include:
1) Achievement patents: domestic scientific and technological achievements, patented technologies and national science and technology projects.
2) Chinese and foreign standards: Chinese national standards, construction standards, building materials standards, industry standards, international standards, international electrical standards, European standards, as well as American, British, German and French national standards and Japanese industrial standards provided by the State Bureau of Technical Supervision and the Ministry of Construction.
3) Scientific and technological literature: including conference literature, professional literature, comprehensive literature and English literature, covering a wide range and having high authority.
4) Institutions: including information on China's famous scientific research institutions, colleges and universities, and information institutions.
6) Wanfang Degree**: The database includes degrees in various disciplines in China**.
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Objectively speaking, there will also be personal subjective feelings:
First of all, CNKI, I have to say, is the industry leader and has the largest audience. In terms of resources, it covers a wide range of resources, with the advantage of journals and doctoral and master's degrees, and the copyright cooperation is perfect, and basically everything that is retrieved can be obtained. If it is insufficient, I personally think that the user experience is average, the page design of the interactive package library is older, and the literature data provided is less.
In addition, the cost is very high, and the forced price increase every year makes various schools distressed, and it is a bit of a monopoly suspicion.
The second VIP, as a big brother, is now in a position that has been overrun by HowNet, and he can't hold his head up. As a journal, VIP is still ahead of CNKI in terms of the breadth of resources and the time of collection, and the integrity of metadata is also the highest, and its importance is becoming more and more important in this era. In addition, the new journal platform has done a good job in terms of interface and user experience, and functionality.
If it is insufficient, it is still on the resources and the audience, except for the journal, other resources are a little stretched, and some of the journal metadata has been sorted out, but it is a little uncomfortable to be unable to obtain it due to no copyright. The audience is also much smaller, and it is not as famous as HowNet.
Finally, Wan Fang, who is also a big brother and the second in a thousand years, was also ridden by CNKI. Wanfang's revised platform has also worked data, and the page design, functionality, and data presentation have done a good job. In the early days, it reached an exclusive cooperation with the Chinese Medical Association and included its high-tech journals, so Wanfang became a prosperous company in the hospital, medical school, and pharmaceutical company.
The shortcomings are also that the full-text rate is a little low.,There's no bright spot or any slot.。。。 The duplicate checking business is not as good as VIP.
Well, this is my opinion, I don't recommend or criticize. There is no doubt that HowNet is the most complete, but it does not mean that everything can be found, and some HowNet does not have VIP Wanfang will have it. So they all have to be used, but CNKI is more expensive, and VIP is cheaper.
Your Excellency, please see you!
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Database is a warehouse that organizes, stores and manages data according to the data structure, and data management is no longer just about storing and managing data, but has transformed into a variety of data management methods required by users. There are many types of databases, from the simplest to store all kinds of data, to large database systems that can store massive amounts of data. In the information-based society, the full and effective management and utilization of all kinds of information resources is a prerequisite for scientific research and decision-making management.
Database technology is the core part of various information systems such as management information system, office automation system, decision support system, etc., and is an important technical means for scientific research and decision-making management. A database is a general data processing system for a unit or an application field, which stores a collection of relevant data belonging to enterprises, business units, groups and individuals. The data in the database is built from a global perspective and is organized, described, and stored according to a certain data model.
Its structure is based on the natural connections between the data, providing all the necessary access paths, and the data is no longer application-specific, but organization-wide, with a holistic structured character. The data in the database is built for many users to share their information, and it has been freed from the limitations and constraints of specific procedures. Different users can use the data in the database in their own usage; Multiple users can share data resources in the database at the same time, that is, different users can access the same data in the database at the same time.
Data sharing not only satisfies the requirements of each user for information content, but also meets the requirements of information communication between users.
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The difference is whether the cloud is good to you or not, and what makes you happy is this one.
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There is also what you have contributed to the society, as long as you work hard, you will have no regrets in life.
The deletion operation in the data is irreparable, sometimes the data in the data table may be deleted due to misoperation, or the database crashes for other reasons, and all the data is lost, especially when there is a large amount of useful data in the database, then it is impossible for you to enter the data again from the beginning, this is the role of the backup database, back up the database, when the above situation occurs, you can restore the previous database through the backup file.
Key features: 1) Realize data sharing.
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