Does anyone know how to write a search query?

1. Document type selection.

On the literature query page, "Document Type Selection" lists the various types of literature databases that can be queried by users in this system. This is a required item and can be single, multiple, or all. The system has a cross-database search function, which can search documents in multiple databases at the same time.

2. Select the query scope.

This is a radio choice item. You can select any one of the items such as author, title, abstract, keyword, classification number, or full-text search to determine that the system will search the corresponding fields in the database. The Full-Text Search option searches all fields in the database.

3. Query the selection of the period.

Used to select the year of publication of the document to be searched. The selected year is equivalent to January 1 to December 31 of the current year, and the default time is all years.

4. Enter a search term.

You can enter a single word closely related to the query topic for search, or you can combine it with "and", "or", and "not" to form a more complex logical search query.

For example, if you want to find ** about computer-aided design, you can use the Chinese phrase "computer-aided design" or the English abbreviation "cad" to express, through the relationship of "or", you can form such a search query: computer-aided design or cad After entering the search conditions, press the "search" button to query the bibliographic list of related literature.

For example: logical "or".

It means that any one of the two search terms it is connected to appears in the results to meet the search conditions, and the search query can be written as: a or b. In some Chinese databases, "+" is used to indicate logical "or".

For example, if you want to retrieve information about "computer", you can express it as: computer + computer. Logical "or" is mainly used to express synonyms of search terms.

Synonyms, full names, abbreviations, etc., in order to fully and completely express the relevant concepts.

For example, to find information about computer-aided design.

**, can be expressed by the Chinese phrase "computer-aided design" or the English abbreviation "cad", through the relationship of "or", can form such a search query: computer-aided design or cad After entering the search conditions, press the "query" button to query the bibliographic list of relevant literature.

"Search" means to check the text or information required for the request. It refers to the use of certain methods and technical means for a specific collection of information based on the specific information needs of users, and the relevant information is found from it according to certain clues and rules.

**Retrieval means that the author's published articles are indexed by the academic retrieval system, and nowadays, no matter what the purpose of the article, it is likely that the article will be published in the journal and searched by the system to be considered an effective publication.

to CNKI. For example, the first step is to open CNKI, go directly to the journal search page, enter the journal name in the search term column, click "Search", and click on the cover of the journal to enter the interface of searching for articles. Here, let's see if the magazine has been updated to the issue you published, and if so, you can select any of the searchability on the current page.

The title of the article or the author's item. As long as the search item corresponds to the search term at the back, you can click on the search at the back, find your own article and the corresponding author, just click on the title of the article, and the regular search page will come out.

A search query is an instruction issued by the searcher to the computer, and it is also the language of human-computer dialogue, and the search query expresses the search intention of the searcher. A search query is usually composed of search terms, logical operators, and wildcards.

and so on. In order to construct an optimal search query and meet the quality standards of the search query, the following five steps are usually processed.

1. First of all, we must fully understand the needs of readers. Only on this basis will it be possible to choose a suitable bibliographic; It is possible to correctly select the search scope and scientifically organize the search strategy.

2. Describe the need for literature in detail in natural language. The terminology used in the presentation should be in commonly used scientific and technical terms.

3. On the basis of natural language expression, the subject of the search should be analyzed, the corresponding search terms should be selected, and the logical relationship between them should be determined.

4. Use logical operators to logically match the selected search terms. It is necessary to pay attention to the use of position operators to adjust the matching relationship between search terms and literature keywords, so as to form a search query that is compatible with "relevance" and "matching" and has high economy.

5. After checking out, the reader will put forward opinions, which is "noise" information, and negative feedback should be given to revise the retrieval strategy.

Strategies for building search queries:

1. The most specific area priority, or the least record surface priority, means that when searching, the most specific concept group is first selected for search, if the literature hit by the search is quite small, then other concept group areas will no longer be added to the search formula; If there are a large number of retrieved literatures, other conceptual panels will be added to the search question to improve the accuracy of the search.

2. Citation bead growth strategy. This strategy starts with a direct search for the most specific conceptual panels in the topic in order to check out at least one Chinese proposition. Searchers find new canonical or free words from this one or more records, add them to the search query, and then search again to find more documents.

3. Fractionation strategy. Sequential fractionation refers to first determining a larger, wider-ranging initial collection of literature, and then gradually increasing the specificity of the search formula, so as to gradually narrow down the Chinese collection until an appropriate number of documents are obtained and the user is satisfied.

4. Building block concept group strategy.

The strategy of building block concept group is to decompose the search topic into several concept group surfaces, and search these concept groups separately first, and list synonyms as completely as possible in each concept group area.

Related words, synonyms.

The Boolean operator "or" is used to connect the subsearch formulas, and then the Boolean operator "and" is used to connect the subsearch queries of all concept groups to form a total search query.

To put it simply, a search query is a retrieval command that can be recognized by the retrieval system by using the relational operators and logical operators in the retrieval system to link the search terms you want to search according to the retrieval requirements in the information retrieval.

How to get it depends on what content you want to retrieve and what search system you use, otherwise no one knows how to get it

For a specific introduction, you can go to the encyclopedia, which has more detailed expressions about search formulas than I said, and there are a lot of things you need to learn if you want to write a number of search formulas, you can go to check related books, as well as the introduction and help of the search system you want to use

The encyclopedia address is.