Parallelism of advanced retrieval refers to AND of Boolean logic, and A and B are retrieval keywords. We want to retrieve the documents with parallel A and B, and the retrieved results refer to keyword A and keyword B***.
Advanced search "or inclusion" refers to Boolean logic "or", and A and B are search keywords. We want to retrieve the "or contains" documents of A and B, and the retrieved results refer to the documents where keywords A and B have appeared.
And, or, no. Boolean logic retrieval is the logical matching of search words or codes by using Boolean logic operators. It is the most commonly used technology in modern information retrieval system, which is applied to advanced retrieval and professional retrieval of databases. AND or NOT is the main boolean logic operator.
The exclusion of advanced retrieval refers to the negation of Boolean logic, and analogies A and B are retrieval keywords. We want to search the literature with A but without B, and the retrieved results refer to the literature related to keyword A but without keyword B.
Classification of retrieval methods
1. Search: Just enter the search word you are looking for, you can find out the search method of related documents, which is an effective way to obtain documents quickly.
2. Advanced retrieval: It provides a more flexible and convenient way to construct retrieval types and freely assemble logical relationships, and can add up to 7 lines to help readers achieve accurate retrieval.
3. Professional retrieval: refers to the way of using logical operators and keywords to construct retrieval formulas for literature retrieval, helping professionals to carry out scientific and technological novelty retrieval.
4. Author's post retrieval: Through the name and unit information of scholars, you can find out all the documents published by scholars and their cited downloads.
5. Sentence retrieval: Through the two keywords entered by the reader, you can find a sentence that contains both words, and realize fact retrieval.
6. One-box search: unified search, all kinds of resources, periodicals, papers, conferences, newspapers, yearbooks, patents and achievements.