A request for information from a database.

There are three general methods for posing queries:

  1. Choosing parameters from a menu: In this method, the database system presents a list of parameters from which you can choose.
  2. Query by example (QBE): In this method, the system presents a blank record and lets you specify the fields and values that define the query.
  3. Query language: Many database systems require you to make requests for information in the form of a stylized query that must be written in a special query language.
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