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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. Christopher J. Date - Wikipedia

   en.wikipedia.org/wiki/Christopher_J._Date

   Chris Date attended High Wycombe Royal Grammar School (U.K.) from 1951 to 1958 and received his BA in Mathematics from Cambridge University (U.K.) in 1962. He entered the computer business as a mathematical programmer at Leo Computers Ltd.

4. Codecademy - Wikipedia

   en.wikipedia.org/wiki/Codecademy

   Codecademy was founded in August 2011 by Zach Sims and Ryan Bubinski. [6] Sims dropped out of Columbia University to focus on launching a venture, and Bubinski graduated from Columbia in 2011. [7]

5. 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.

6. SQL Plus - Wikipedia

   en.wikipedia.org/wiki/SQL_Plus

   The first version of SQL Plus was called UFI ("User Friendly Interface"). UFI appeared in Oracle database releases up to Version 4. After Oracle programmers had added new features to UFI, its name became Advanced UFI.

7. Microsoft SQL Server - Wikipedia

   en.wikipedia.org/wiki/Microsoft_SQL_Server

   Microsoft SQL Server (Structured Query Language) is a proprietary relational database management system developed by Microsoft.As a database server, it is a software product with the primary function of storing and retrieving data as requested by other software applications—which may run either on the same computer or on another computer across a network (including the Internet).

8. Oracle Database - Wikipedia

   en.wikipedia.org/wiki/Oracle_Database

   Oracle Database (commonly referred to as Oracle DBMS, Oracle Autonomous Database, or simply as Oracle) is a proprietary multi-model [4] database management system produced and marketed by Oracle Corporation.

9. SQLSTATE - Wikipedia

   en.wikipedia.org/wiki/SQLSTATE

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