Information storage is that foundation of information retrieval. The stored information includes original document data, pictures, video and audio. The original information is converted into computer language and stored in the database. After the user inputs the query request according to the intention, the retrieval system searches the information related to the query according to the request, calculates the information similarity through a certain matching mechanism, and converts the information into output according to the order from large to small.
Extended data:
According to the storage and retrieval objects, information retrieval can be divided into:
1, literature retrieval
Obtain documents according to study and work needs. With the development of modern network technology, literature retrieval is more accomplished by computer technology. With the help of computer technology, literature retrieval is carried out by modern retrieval means such as CD-ROM and online retrieval.
2. Information retrieval
Extract the data stored in the database according to the needs of users. The result of data retrieval will generate a data table which can be returned to the database or further processed as an object.
3, fact retrieval
It includes not only the retrieval, arithmetic operation, comparison and mathematical deduction of numerical data, but also the retrieval, comparison, deduction and logical reasoning of non-numerical data (such as facts, concepts, ideas and knowledge). It is required that the retrieval system can not only find out the original data or facts from the data (facts) set, but also deduce and infer new data or facts from the existing basic data or facts.