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2. 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] The company, headquartered in New York City, raised $2.5 million in Series A funding in October 2011 and $10 million in Series B funding in June 2012 ...

3. 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.

4. Relational database - Wikipedia

   en.wikipedia.org/wiki/Relational_database

   A relational database (RDB[1]) is a database based on the relational model of data, as proposed by E. F. Codd in 1970. [2] A database management system used to maintain relational databases is a relational database management system (RDBMS). Many relational database systems are equipped with the option of using SQL (Structured Query Language ...

5. Join (SQL) - Wikipedia

   en.wikipedia.org/wiki/Join_(SQL)

   A join clause in the Structured Query Language (SQL) combines columns from one or more tables into a new table. The operation corresponds to a join operation in relational algebra. Informally, a join stitches two tables and puts on the same row records with matching fields : INNER, LEFT OUTER, RIGHT OUTER, FULL OUTER and CROSS.

6. 52 Helpful Things On The Web That Are Free And That ... - AOL

   www.aol.com/52-helpful-things-free-everyone...

   There are a jaw-dropping 5.35 billion internet users around the world. But you’d be surprised how many people are not aware of the free resources available to them. The post 52 Helpful Things On ...

7. SQL syntax - Wikipedia

   en.wikipedia.org/wiki/SQL_syntax

   SQL syntax. The syntax of the SQL programming language is defined and maintained by ISO/IEC SC 32 as part of ISO/IEC 9075. This standard is not freely available. Despite the existence of the standard, SQL code is not completely portable among different database systems without adjustments.

8. 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 is represented in terms of tuples, grouped into relations. A database organized in terms of the relational model is a ...

9. Hierarchical and recursive queries in SQL - Wikipedia

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

   Hierarchical and recursive queries in SQL. A hierarchical query is a type of SQL query that handles hierarchical model data. They are special cases of more general recursive fixpoint queries, which compute transitive closures. In standard SQL:1999 hierarchical queries are implemented by way of recursive common table expressions (CTEs).