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2. Exercism - Wikipedia

   en.wikipedia.org/wiki/Exercism

   Exercism is an online, open-source, free coding platform that offers code practice and mentorship [4] on 74 different programming languages. [ 3 ] [ 5 ] History

3. Codecademy - Wikipedia

   en.wikipedia.org/wiki/Codecademy

   Codecademy is an American online interactive platform that offers free coding classes in 13 different programming languages including Python, Java, Go, JavaScript, Ruby, SQL, C++, C#, Lua, and Swift, as well as markup languages HTML and CSS.

4. Comparison of online source code playgrounds - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_online...

   Free No No No Yes Db2, Firebird, MariaDB, MySQL, Node.js, Oracle, Postgres, SQL Server, SQLite, YugabyteDB ExtendsClass [an] Free Yes No No Yes MySQL, SQLite (SQL.js) PhpFiddle [ao] Free Yes No No Yes MySQL, SQLite runnable [aj] Free Yes Yes Yes No SQL Fiddle [ap] Free No No No Yes MySQL, Oracle, PostgreSQL, SQLite (WebSQL), SQLite (SQL.js)

5. How to learn SQL: These are the best online courses

   www.aol.com/learn-sql-best-online-courses...

   SQL is used to communicate with databases. Skip to main content. Sign in. Mail. 24/7 Help. For premium support please call: 800-290-4726 more ways to reach us. Mail. Sign in ...

6. 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 ...

7. 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).

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   Discover the best free online games at AOL.com - Play board, card, casino, puzzle and many more online games while chatting with others in real-time.