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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. Query optimization - Wikipedia

   en.wikipedia.org/wiki/Query_optimization

   Query plans for nested SQL queries can also be chosen using the same dynamic programming algorithm as used for join ordering, but this can lead to an enormous escalation in query optimization time. So some database management systems use an alternative rule-based approach that uses a query graph model.

4. Relational model - Wikipedia

   en.wikipedia.org/wiki/Relational_model

   The relational model (RM) is an approach to managing data using a structure and language consistent with first-order predicate logic, first described in 1969 by English computer scientist Edgar F. Codd, [1] [2] where all data are represented in terms of tuples, grouped into relations.

5. Skyline operator - Wikipedia

   en.wikipedia.org/wiki/Skyline_operator

   The skyline operator is the subject of an optimization problem and computes the Pareto optimum on tuples with multiple dimensions.. This operator is an extension to SQL proposed by Börzsönyi et al. [1] to filter results from a database to keep only those objects that are not worse in multiple dimensions than any other.

6. NonStop SQL - Wikipedia

   en.wikipedia.org/wiki/NonStop_SQL

   NonStop SQL is a commercial relational database management system that is designed for fault tolerance and scalability, currently offered by Hewlett Packard Enterprise. The latest version is SQL/MX 3.4. The product was originally developed by Tandem Computers. Tandem was acquired by Compaq in 1997. Compaq was later acquired by Hewlett-Packard ...

7. Hands-on - Wikipedia

   en.wikipedia.org/wiki/Hands-on

   Hands-on" refers to human interaction, often with technology. It implies active participation in a direct and practical way. Hands-on or Hands-On may refer to: Hands-on computing, a branch of human-computer interaction (HCI) research; Hands-on-throttle-and-stick (HOTAS) Hands-On Electronics magazine; Hands-On Mobile company; Global Hands-On ...