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Learn how to download and use Wikipedia dumps, which are free copies of all available content for offline access or database queries. Find out the differences between multistream and non-multistream dumps, and how to deal with compressed and large files.
SQL is a declarative language used to manage data, especially in a relational database management system (RDBMS). It consists of many types of statements, such as Data Query Language (DQL), Data Definition Language (DDL), Data Control Language (DCL), and Data Manipulation Language (DML).
Learn about the history, architecture, features and compatibility of the Access Database Engine, a database engine used by Microsoft products. The Access Database Engine has been superseded by SQL Server for larger databases and supports SQL queries, Unicode, views and replication.
SQL-92 was the third revision of the SQL database query language, published in 1992. It introduced many new features such as data types, operations, constraints, and information schema.
Microsoft Access is a relational database program from Microsoft that combines a graphical user interface and software-development tools. It can store data in its own format or import or link to other databases, and supports Visual Basic for Applications programming language.
A query plan is a sequence of steps to access data in a SQL database. Learn how to view, understand and improve query plans using graphical, textual or plan table tools.
Learn about data control language (DCL), a syntax for controlling access to data in a database, and its variations in different SQL systems. See examples of DCL commands such as GRANT, REVOKE, and DENY in Microsoft SQL Server, Oracle Database, MySQL, and PostgreSQL.
Much of the data that makes up the Wikipedia encyclopedia is stored in a SQL database. It can sometimes be useful to run queries against this database to extract information that is otherwise hard to find. For example: Articles with H.M.S. in their title that have not been edited for 12 months.