Web Reference: SQL is a standard language for storing, manipulating and retrieving data in databases. Our SQL tutorial will teach you how to use SQL in: MySQL, SQL Server, MS Access, Oracle, PostgreSQL, and other database systems. Learn how to use SQL to store, query, and manipulate data. SQL is a special-purpose programming language designed for managing data in a relational database, used by thousands of apps and organizations. Mar 10, 2026 · A database query is a request for a database’s data so we can retrieve or manipulate it. But, when should we query a database, and what exactly are we doing? In this article, we’ll introduce you to database queries with multiple common uses, including SQL, NoSQL, MongoDB, PostgreSQL, and more.
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