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2. Comparison of online source code playgrounds - Wikipedia

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

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

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

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

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5. 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

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. Join (SQL) - Wikipedia

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

   Actual SQL implementations normally use other approaches, such as hash joins or sort-merge joins, since computing the Cartesian product is slower and would often require a prohibitively large amount of memory to store. SQL specifies two different syntactical ways to express joins: the "explicit join notation" and the "implicit join notation".