Medline: The international comprehensive biomedical information bibliographic database produced by NLM National Library of Medicine is the most authoritative biomedical literature database in the world.

Sci: American Science Citation Index (SCI) was founded by institute for scientific information (ISI) on 1957 in Philadelphia, USA. Is a citation database created and published by institute for scientific information (ISI)1961+0.

2. The main categories involved are different.

Medline: The most authoritative biomedical literature database.

Sci: the main retrieval tool for scientific statistics and scientific evaluation.

Webofscience system is mainly used to find the inclusion of SCI database, and medline is mainly searched by MEDLINE CD-ROM retrieval system. The two involve different fields and their authority cannot be compared.

Extended data:

Scientific citation index is based on Bradford's literature dispersion theory and E.Garfield's citation analysis theory. It evaluates and studies academic journals and scientific research achievements in many aspects by counting the cited frequency of papers, so as to judge the performance of scientific research output of a country or region, scientific research units and individuals and reflect its international academic level. Therefore, SCI is currently recognized as the most authoritative scientific and technological literature retrieval tool in the world.

With its unique citation approach and comprehensive scientific data, scientific citation index ranks journals and papers through the statistics of a large number of citations, and then obtains quantitative indicators such as impact factors, citation frequency and real-time index of a journal and paper in a certain discipline.

The high frequency of citation shows that this paper has a great influence in its research field and has attracted the attention of international peers with high academic level. Because the papers included in SCI are mainly in the basic research field of natural science, SCI indicators are mainly suitable for evaluating the achievements of basic research, and the main achievements of basic research are academic papers. Therefore, how to evaluate the basic research results is often simplified as how to evaluate the influence of the contents contained in the paper on the progress of scientific knowledge.

Baidu encyclopedia-scientific citation index

Baidu encyclopedia -MEDLINE