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In relational databases a virtual column is a table column whose value(s) is automatically computed using other columns values, or another deterministic expression. Virtual columns are defined of SQL:2003 as Generated Column, [1] and are only implemented by some DBMSs, like MariaDB, SQL Server, Oracle, PostgreSQL, SQLite and Firebird (database server) (COMPUTED BY syntax).
Wikipedia offers free copies of all available content to interested users. These databases can be used for mirroring, personal use, informal backups, offline use or database queries (such as for Wikipedia:Maintenance).
KEXI – Kexi database file (SQLite-based) KEXIC – shortcut to a database connection for a Kexi databases on a server; KEXIS – shortcut to a Kexi database; LDB – Temporary database file, only existing when database is open; LIRS – Layered Intager Storage. Stores intageres with characters such as semicolons to create lists of data.
SQL was initially developed at IBM by Donald D. Chamberlin and Raymond F. Boyce after learning about the relational model from Edgar F. Codd [12] in the early 1970s. [13] This version, initially called SEQUEL (Structured English Query Language), was designed to manipulate and retrieve data stored in IBM's original quasirelational database management system, System R, which a group at IBM San ...
A number of different types of 4GLs exist: Table-driven (codeless) programming, usually running with a runtime framework and libraries. Instead of using code, the developer defines their logic by selecting an operation in a pre-defined list of memory or data table manipulation commands.
Can convert dBASE data from .dbf files to CSV, HTML, Microsoft Excel 2003 and below, Microsoft Excel 2008 and above, or XML. dbDOS PRO 4.0 May 6, 2015 dBase, LLC Unveils New Version of dbDOS PRO 4! [33] dbDOS PRO 4, the latest version of the best-selling solution for supporting MS-DOS based applications on Windows Vista and above operating systems.
An identity column differs from a primary key in that its values are managed by the server and usually cannot be modified. In many cases an identity column is used as a primary key; however, this is not always the case. It is a common misconception that an identity column will enforce uniqueness; however, this is not the case. If you want to ...
MySQL (/ ˌ m aɪ ˌ ɛ s ˌ k juː ˈ ɛ l /) [6] is an open-source relational database management system (RDBMS). [6] [7] Its name is a combination of "My", the name of co-founder Michael Widenius's daughter My, [1] and "SQL", the acronym for Structured Query Language.