A query is a mechanism to extract new information from given information stored in some form. The extracted information is called the answer to the query. In the most general sense, a query is an arbitrary (computable) function, from some input to some output.
In the context of computing and databases, a query refers to a request or a question made to a database management system (DBMS) or search engine in order to retrieve specific information or perform an action on the data.
A query is typically expressed in a specific query language, such as SQL (Structured Query Language) for relational databases, or a search syntax for search engines. The query specifies the criteria or conditions that the data must meet, and the DBMS or search engine processes the query to return the desired results.
Queries can range from simple to complex, depending on the requirements and the complexity of the data being queried. They can involve searching for specific records, filtering data based on conditions, sorting data, performing calculations or aggregations, joining multiple tables, and more.
In summary, a query is a request or command used to retrieve, manipulate, or perform operations on data stored in a database or to search for specific information in a search engine.
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A query is a mechanism to extract new information from given information stored in some form. The extracted information is called the answer to the query. In the most general sense, a query is an arbitrary (computable) function, from some input to some output.
Explanation:
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In the context of computing and databases, a query refers to a request or a question made to a database management system (DBMS) or search engine in order to retrieve specific information or perform an action on the data.
A query is typically expressed in a specific query language, such as SQL (Structured Query Language) for relational databases, or a search syntax for search engines. The query specifies the criteria or conditions that the data must meet, and the DBMS or search engine processes the query to return the desired results.
Queries can range from simple to complex, depending on the requirements and the complexity of the data being queried. They can involve searching for specific records, filtering data based on conditions, sorting data, performing calculations or aggregations, joining multiple tables, and more.
In summary, a query is a request or command used to retrieve, manipulate, or perform operations on data stored in a database or to search for specific information in a search engine.
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