Learn what a query is, how it works in databases and search engines, plus query types and languages like SQL with clear, simple examples. query , inquiry, enquiry - A query is a single question; an inquiry (or enquiry) may be a single question or extensive investigation (i.e. a series of questions). Query is a federated search platform for security data providing expanded data visibility without centralization. The meaning of QUERY is question, inquiry. How to use query in a sentence. Synonym Discussion of Query. Definition of query noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. 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 The DataFrame.index and DataFrame.columns attributes of the DataFrame instance are placed in the query namespace by default, which allows you to treat both the index and columns of the frame as a column in the frame. A query is a question, especially one that you ask an organization, publication, or expert. If you have any queries about this insurance, please contact our call center. QUERY definition: 1. a question, often expressing doubt about something or looking for an answer from an authority…. Learn more. The most popular query language is structured query language or SQL. One reason for its popularity is that SQL is specifically designed to interact with databases, even databases containing large amounts of data.