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  2. SQL - Wikipedia

    en.wikipedia.org/wiki/SQL

    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 ...

  3. Hierarchical and recursive queries in SQL - Wikipedia

    en.wikipedia.org/wiki/Hierarchical_and_recursive...

    Recursive CTEs from the standard were relatively close to the existing implementation in IBM DB2 version 2. [1] Recursive CTEs are also supported by Microsoft SQL Server (since SQL Server 2008 R2), [ 2 ] Firebird 2.1 , [ 3 ] PostgreSQL 8.4+ , [ 4 ] SQLite 3.8.3+ , [ 5 ] IBM Informix version 11.50+, CUBRID , MariaDB 10.2+ and MySQL 8.0.1+ . [ 6 ]

  4. Relational algebra - Wikipedia

    en.wikipedia.org/wiki/Relational_algebra

    The relational algebra uses set union, set difference, and Cartesian product from set theory, and adds additional constraints to these operators to create new ones.. For set union and set difference, the two relations involved must be union-compatible—that is, the two relations must have the same set of attributes.

  5. MySQL - Wikipedia

    en.wikipedia.org/wiki/MySQL

    MySQL (/ ˌ m aɪ ˌ ɛ s ˌ k juː ˈ ɛ l /) [5] is an open-source relational database management system (RDBMS). [5] [6] Its name is a combination of "My", the name of co-founder Michael Widenius's daughter My, [7] and "SQL", the acronym for Structured Query Language.

  6. AOL Mail

    mail.aol.com

    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  7. Oracle Forms - Wikipedia

    en.wikipedia.org/wiki/Oracle_Forms

    Oracle Forms version 4.5 was really a major release rather than a "point release" of 4.0 despite its ".5" version number. It was named 4.5 in order to meet contractual obligations to support Forms 4 for a period of time for certain clients so it could market 4.5 as being a patch to 4.0, even though a full install was required, rather than ...

  8. Database normalization - Wikipedia

    en.wikipedia.org/wiki/Database_normalization

    Download as PDF; Printable version; In other projects ... Version 2 Texas 1: Learning SQL: ... [15] See also Denormalization ...

  9. PL/SQL - Wikipedia

    en.wikipedia.org/wiki/PL/SQL

    For example, Sybase ASE and Microsoft SQL Server have Transact-SQL, PostgreSQL has PL/pgSQL (which emulates PL/SQL to an extent), MariaDB includes a PL/SQL compatibility parser, [14] and IBM Db2 includes SQL Procedural Language, [15] which conforms to the ISO SQL’s SQL/PSM standard.