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Query, a precise request for information retrieval made to a database, data structure or information system Query language, a computer language used to make queries into databases and information systems; Query string, in the World Wide Web, is an optional part of a URL; Web search query, a query entered by users into web search engines
A query language, also known as data query language or database query language (DQL), is a computer language used to make queries in databases and information systems. In database systems, query languages rely on strict theory to retrieve information. [ 1 ]
A query string is a part of a uniform resource locator that assigns values to specified parameters.A query string commonly includes fields added to a base URL by a Web browser or other client application, for example as part of an HTML document, choosing the appearance of a page, or jumping to positions in multimedia content.
A web query or web search query is a query that a user enters into a web search engine to satisfy their information needs.Web search queries are distinctive in that they are often plain text and boolean search directives are rarely used.
A search engine is a software system that provides hyperlinks to web pages and other relevant information on the Web in response to a user's query. The user inputs a query within a web browser or a mobile app, and the search results are often a list of hyperlinks, accompanied by textual summaries and images. Users also have the option of ...
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This functionality is called the "query optimizer" as it is responsible for finding the best possible execution plan for the query, within applicable constraints. The SELECT statement has many optional clauses: SELECT list is the list of columns or SQL expressions to be returned by the query.
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